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1 WELCOME TO THE LIST-Duffy-Includes link to Jim Koehler's
EXTREMELY important web site.
2 INFO I'VE COLLECTED-Duffy-Many web sites, several of which are
VERY important.
5 ANOTHER REPLY FROM JIM KOEHLER-Duffy.
6 MAGNETIC MEASURMENTS HANDBOOK-Duffy.
7 SENSOR DEBATE-Duffy-Koehler & toroid versus solenoid.
8 ELECTRONIC CIRCUIT GUIDEBOOK, VOLUME #1, SENSORS-Duffy.
9 RE: SENSOR DEBATE-Duffy - Fountain.
10 DEPLOYMENT OF SENSORS-Duffy-Dalton, towed sensors, etc.
11 12, 13, 14 & 15: Early thoughts on toroidal forms.
16 RE: DEPLOYMENT OF SENSORS-Fountain-Dalton, towed, etc.
17 RE: TOROIDAL SENSOR-Fountain-Thin wall PVC pipe.
21 USING PVC-Duffy and reply from Koehler on square toroid.
22 PVC TOROID-Duke-Toroid with gap.
23 RE: TOROIDAL SENSOR-Moreland-Square toroid & PVC bending.
24 RE: PVC TOROID-Duffy-Question on Posting 22.
25 RE: TOROIDAL SENSOR-Duffy-Question on Posting 23.
26 RE: PVC TOROID-Duke-Comments on flexible drain hose.
28 RE: DEPLOYMENT 0F SENSORS-Duffy-Dalton range estimates.
29 RE: DEPLOYMENT OF SENSORS-Duke-Cable length.
30 RE: DEPLOYMENT OF SENSORS-Duffy-Cable length, shielding, etc.
31 RE: DEPLOYMENT OF SENSORS-Williamson-Dalton two fish mag, cable
length, etc.
34 RE: DALTON'S MAGS-Williamson-Size of Dalton two-fish mag.
35 MX-500-Duffy-Website and info on towed mag with toroids.
36 HAND-HELD U/W MAG-Duffy-Photos, website & 3-axis sensors.
38 SOME RECENT DISCUSSIONS-Duffy-Fluids, sensors, sensitivity and
shielded cables.
39 PPM PROGRESS-Koehler-Summary of recent developments on Koehler
Proton Precession Magnetometer
(Gradiometer). Request for help on laying out and designing
pc-boards.
40 RE: PPM PROGRESS-Gaboury-Link to www.ivex.com, and others, for
board desirn software and details on his new design company.
41 RE: PPM PROGRESS-Duffy-References to Moreland pages on board
design.
42 RE: PPM PROGRESS-Koehler-More on www.ivex.com PCB
design software and his experience with it and request for help
on producing PB boards.
43 PVC TOROIDS-Fountain-Construction of forms from PVC pipe.
44 RE: PVC TOROIDS-Koehler-Filling forms with hot sand.
45 TOROID FORMS-Barnes-Fisher-Price Rock-a-Stack toroid form.
46 RE: TOROID FORMS-Duffy-Photo of Rock-a-Stack and comments on
larger toroid forms.
47 GEOMETRICS 601-Duffy-three axis sensor, cable length, etc.
48 PATRICK RE DONUTS-Martin-bigger, stronger toroid and "Hall
Effect" sensor UGN3503U.
49 PATRICK RE GEOMETRICS 601-Martin-Comments on problems, sensors
and his web page.
50 RE: GEOMETRICS 601-Smith-Fisher-Price knockoff, multiple
windings, etc.
51 RE: TOROID FORMS-Barnes-Questions for Koehler.
52 RE: PATRICK RE DONUTS-Barnes-Comments on Cris Martin Posting #49
and on "Hall Effect" sensor.
53 ALTERNATE MAGNETOMETER-Duke-Building a mag but wants larger form
as well as comments and questions on flux gate mag. Also gives a
webpage link with sensor data.
54 RE: ALTERNATE MAGNETOMETER-Duffy-Very interesting comment on
construction of Geometrics toroid sensors.
55 RE: ALTERNATE MAGNETOMETER-Smith-Wrecks off coast of South
Africa.
56 RE: ALTERNATE MAGNETOMETER-Moreland-ASIC magnetometer, fluxgate,
Speake, Fat Quarters and web address.
57 RE: ALTERNATE MAGNETOMETER-Carey-Planet Electronics and Shark
Electronics mags.
58 TOROID FORMS-Martin-22 mm plastic plumbing pipe.
60 RE: TOROID FORMS-Koehler-partial reply to early Barnes posting.
61 RE: ALTERNATE MAGNETOMETER-Koehler-Drifting of fluxgate
magnetometer.
63 A BRIEF PROGRESS REPORT-Koehler-Link for update on PPM.
64 RE: A BRIEF PROGRESS REPORT-Duffy.
65 TOROID FORM-Duffy-Info from Foster metal detecting forum on how
to make a circular coil.
68 RE: TOROID FORM-Duffy-Answer to Geary.
70 RE: TOROID FORM-Duffy-More on trucks at 10 feet.
73 RE: A BRIEF PROGRESS REPORT-Duffy-Gives Eric Foster's Metal
Detector website address.
75 RE: TG METAL DETECTING COIL-Martin-Gives web site for technical
information on metal detectors.
76 PVC FORM-Duke-Octagon toroid and temperature question.
78 PIC. FORM AFTER TRIMMING-Duke-After trimming octagon to size.
79 PIC. FINISHED COIL-Duke-Picture of wound octagon coil.
80 PIC. FORM BEFORE TRIMMING-Duke-Before trimming octagon to size.
84 TOROID FORM-Jerry Smith-Info on Irish fishing float for toroid.
85 RE: TOROID FORM-Koehler-Commercial availability of above.
87 PRECESSION VS TEMPS?-Duke-Precession/decay rates & temperature.
88 PROTON LIQUID-Eric-Extract from Archaeology (Oxford) in relation
to hydrogen atoms and relaxation [decay] time.
89 RE: PROTON LIQUID-Duffy-"Wizard" charcoal fluid.
90 RE: PROTON LIQUID-Koehler-Reply to above.
91 MORE EXTRACTS FROM ARCHAEOMETRY-Eric-Ferromagnetic contamination,
paramagnetic qualities of free oxygen, and metal inclusions in
plastic piping.
92 RE: PROTON LIQUID-Duffy-Wizard charcoal starter.
94 RE: PROTON LIQUID-Barnes-Wesson brand salad oil.
97 MAGNETOMETER FLUID-Barnes-Tempone and Overhauser site.
99 SOLID-STATE MAGNETIC RESONANCE SPECTROSCOPY-Ginter.
100 RE: SENSORS-Ginter reply to Barnes OF-Proton precession
frequency, frequency in general, pulse induction units, Gold Bug 2
and Ginter's comments on PI, hot rocks, etc.
109 NEW DOCUMENT-Koehler-Jim's updated PPM document.
110 DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Seppa-Sub zero use
with water as the proton fluid.
111 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Duffy-Good
advice.
112 MY OPINION OF THE DALTON UNIT-Koehler-Detailed analysis of the
Dalton gradiometer by a magnetometer master.
113 RE: MY OPINION OF THE DALTON UNIT-Duffy-Three 3 axis sensors.
115 GEOMETRICS G826A-Rssnk-Unleaded gasoline and Coleman fluid.
117 RE: GEOMETRICS G826A-Duffy-Sensors on 803/826A & towed fish.
118 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Barnes-Website
for sounds and details of his magnetometer design.
119 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Duffy-Barnes unit
for about US$100.
120 RE: MY OPINION OF THE DALTON UNIT-Duffy-Chart recorder for
marine use.
121 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Barnes-Confirming
~$100.00 price for Barnes unit.
122 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Martin-Moreland
design,Fat Quarters Software, web sites, etc.
123 MAG ERROR-Rssnk-G826A alignment.
125 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Sharp-Comments on
Dalton, Fisher and Geometrics units.
126 DALTON & OTHER GRADIOMETERS/DIFFERENTIAL MAGNETOMETERS-
Seppa-Request for input from Dalton
magnetometer users.
127 RE: DALTON & OTHER GRADIOMETERS/DIFFERENTIAL MAGNETOMETERS-
Duffy-Recommend Barnes CD plans
for mag construction and some comments about Dalton mag.
129 FORM FOR KOEHLER TOROIDAL SENSOR-Seppa-Status of Fisher-Price
Rock-a-Stack toy future availability. [Note - they have
been discontinued but as of VIII/30/00 they are still available.]
130 RE: FORM FOR KOEHLER TOROIDAL SENSOR-Smith-Info on Asian
knockoff of the Fisher-Price Rock-a-Stack available in South Africa
and permeability comments.
131 TWO ARTICLES ON MAGS-Seppa-Citations for 2 articles about
prospecting with magnetometers; one alright and one not so good.
136 RE: TRUCK AT 10 FEET-Moreland-PI board from Eric Foster.
137 RE: FORMS FOR KOEHLER TOROIDAL SENSOR-Seppa-Weighing filled
toroids to verify if there is any loss.
138 DIURNAL & OTHER VARIATIONS - COMPENSATION REQUIRED?-Seppa-
Detailed questions on possible variations.
139 DIURNAL AND OTHER VARIATIONS-Koehler-Detailed information on
variations and the gradiometer.
141 PRECESSION FREQUENCY?-Smith-Question on precession frequency in
South Africa.
142 RE: PRECESSION FREQUENCY?-Koehler-Comment on above.
143 RE: PRECESSION FREQUENCY?-Fraser-Calculation for this question.
144 EUREKA ANOMALY MAGNETOMETERS-Seppa.
145 RE: EUREKA ANOMALY MAGNETOMETERS-Barnes-"That's a pretty steep
price to pay for a Pocket Compass."
146 TOROID SENSOR FORMS-Seppa-Summary of almost all of the Forum
Postings which have touched on this subject.
147 RE: TOROID FORM-Jerry Smith-Nice photo of the Irish Commercial
Fishing Float of about 8 inch outside diameter.
148 RE: TOROID SENSOR FORMS-Koehler-General information on toroids.
149 SENSORS-Rssnk-Geometrics 826A performance.
150 RE: SENSORS-Williamson-Questions of Geometrics 826A.
153 MORE TOROID FORMS!-Barnes-Gerber toroids and some comments on
proton rich fluids.
154 RE: TRUCKS AT 10 FEET AND NEW MAG ON THE
BLOCK?-Seppa-Information on CST ferrous object finder and the Fisher
FX-3 differential induction magnetometer.
155 PRECESSION FREQUENCY- WRITE IT DOWN-Barnes-Shows the frequency
of proton precession of 42.5743751 Mhz per Tesla and additional
information.
156 RE: TRUCKS AT 10 FEET-Moreland-Air test of his fluxgate.
157 MAGNETIC METHODS USED IN PROSPECTING-Seppa-Near complete text
of magnetic method section of USGS book.
158 COST OF OVERHAUSER GRADIOMETER POS-2 FROM QMLAB-Seppa-Link.
159 POSSIBLE COATINGS FOR TOROIDAL FORMS AND COILS???-Seppa.
163 RE: HELP-Seppa-Some basic advice for new members.
167 RE: MAGNETIC RESEARCH, INC.????-Whitney-He bought the book from
them and likes it.
169 TOROIDAL COIL FORMS-Seppa-Availability of forms.
170 RE: TOROIDAL COIL FORMS-Fraser-Non-magnetic metal for forms.
171 MAGNETIC ANOMALIES, ETC.-Dewhurst-Questions, answers and
Jalander fluxgate magnetometer.
172 NON-MAGNETIC METAL CASES-Strout-Sources.
173 NON-MAGNETIC METAL CASES-Strout-Interesting comments on tapes
used to wrap toroids.
174 MAGNETIC ANOMALIES, ETC.-Vizmuller-Interesting plans for
building sensors for fluxgate magnetometers/gradiometers and also
a novel way of energizing the earth to increase the magnetic field
of buried objects. Also offers cores and gradiometer schematic and
parts list for a flux-gate gradiometer.
177 PROTON RICH SUBSTANCES REVIEWED & SOME UNANSWERED QUESTIONS
-Seppa.Reshash of Posting #88
and items from Koehler manuscript.
178 RE: PROTON RICH SUBSTANCES REVIEWED & SOME UNANSWERED
QUESTIONS-Dewhurst-Suggestion as to
why hydrogen rich solids will not work in PPMs.
179 WESSON SALAD OIL-Seppa-Comments and questions on the several
different types of "salad oil" produced by Wesson.
183 WESSON OIL-Barnes-His contact is no longer on this plane and
Ketchup bottles as solenoids.
185 RE: TEMPONE-Barnes-Phil's reiteration of the information that
he had been able to find on Tempone.
189 ERIC, ET AL - EFFECT OF FREEZING ON PROTON RICH FLUIDS?-Seppa.
191 MATERIALS FOR LIQUID FILLED COIL FORMS-Seppa-Quotes and
questions.
192 PROTON SOURCES-Kirby-Question on Hydrogen gas.
193 RE: PROTON SOURCES-Boetzkes-Answers above question.
194 ROB CURRELL, ET AL.-RE EFFECTS OF FREEZING-Seppa-More on
various liquids and solids, para magnetic free oxygen, alcohols,
etc.
195 LEE FRASER, ET AL.-RE: TOROIDAL COIL FORMS-Seppa-Questions on
shielding of toroids with aluminium foil.
198 RE: LEE FRASER, ET AL.-RE: TOROIDAL COIL
FORMS-Fraser-Electrostatic shielding and some comments on fluids.
199 DALTON MAGNETOMETER REVIEWED-Seppa-Most of the details from the
review in a national treasure hunting magazine.
202 GSM-19 OVERHAUSER SYSTEM MAGNETOMETER-Seppa-Web site link.
203 RE: DALTON MAGNETOMETER THEORY-Davidson-Question on Dalton beat
frequency.
205 RE: 1 Hz BEAT SOUNDS REVEALED-Barnes-Information on how to
actually hear the beat sounds on Phil's website.
206 RE: GSM-19 OVERHAUSER SYSTEM MAGNETOMETER-Smith-Comments on
distilled water, de-oxigenization, Overhauser and Tempone.
207 RE: DALTON MAGNETOMETER THEORY-Kirby-Comments on beat
frequency.
208 RE: DALTON MAGNETOMETER THEORY-Koehler-Comments on beat
frequency and question about the Dalton magnetometer.
209 DALTON-LIEBHAZET 3 MAG-Seppa-Answer to above question.
210 RE: 1 HZ BEAT SOUNDS GOOD-Davidson-Thanks to Phil for sound and
comments on BFOs and PIs.
211 S.A. MAGNETIC FIELD, AQUASCAN, TOROIDS, PROTON FLUID, GPS,
DGPS, ETC.-Seppa from George Davidson.
212 COPPER WIRE CONTAMINATED WITH FERROUS MATERIALS-Seppa.
213 FERROUS CONTAMINATION OF COPPER WIRE AND PLASTIC-Seppa.
215 TEMPONE AS A PROTON RICH LIQUID-Seppa.
217 USEFUL PAGE-Fraser-Link to Geometrics and recommendation for
the "Applications Manual for Portable Magnetometers."
219 RE:-Koehler-Giving site address for construction plans in
answer to new members.
220 IMPROVED GPS ACCURACY-Seppa.
221 INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Seppa.
223 MAGNETIC FIELD THEORY AND BASIC CONCEPTS-Seppa-Link to 9 slides
with outline of university lecture on subject shown.
224 OVERVIEW OF ALL TYPES OF MODERN MAGNETOMETERS-Seppa-Link.
225 ELSEC 7706 MARINE PROTON MAGNETOMETER-Seppa-Link.
226 RE:INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Fraser-Gives
link to Geometrics publications and the opening of the discussion on
bifilar windings.
227 RE:INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Kirby-Comments
on Fraser's bifilar document.
228 APPLICATIONS MANUAL FOR PORTABLE MAGNETOMETERS-Seppa-Link to
this excellent (58 page) document, courtesy of Lee Fraser.
233 RE:-Duffy-Link to oxygen analyzer device description.
234 BIFILAR WINDINGS-Kirby.
237 DICTIONARY OF TECHNICAL TERMS FOR AEROSPACE USE-Seppa-Link.
238 PARAMAGNETIC QUALITIES OF FREE OXYGEN-Seppa.
250 BIFILAR WINDINGS-RECAP OF RECENT POSTINGS #s 226 through # 248
(Latter by Jim Koehler.)
256 GRADIOMETER CIRCUITS ARE NOW AVAILABLE-Koehler-Link for circuit
drawings for Koehler's single sensor and dual sensor magnetometers.
Also links for his detailed manuals.
257 DETECTION DISTANCES FOR ELSEC RECORDING PROTON MAGNETOMETER
7706-Seppa.
258 SHARK ELECTRONICS WEB SITE-COURTESY OF BOB CAREY-Seppa.
264 RE:MAGNET SELECTION HELP NEEDED-Martin-Magnetism of pins on
microprocessor chips and info on gauss/tesla relationship.
267 CHEMICAL RESISTANCE FOR GREEN FISHING FLOAT TOROIDAL
FORM-Seppa.
268 RE: TESTS FOR MAGNETIC MATERIALS-Davidson-Detailed method of
determining magnetic buildup. Makes an interesting point about
selecting the "least offensive" of the various materials.
269 RE:HDZF-Aprewitt.
273 RE: TESTS FOR MAGNETIC MATERIALS-Martin-Comments on his magnet
with a strength of 3500 gauss and five links with information.
274 RE: TESTS FOR MAGNETIC MATERIALS-Eric-Comments on magnetic
impurities in copper wire and other materials.
275 RE: TESTS FOR MAGNETIC MATERIALS-Boetzkes-Detailed (3 pages)
explanation of magnetic fields in general to include diamagnetic,
paramagnetic and ferromagnetic materials. VERY important for
conceptual understanding.
276 RE:FISHER PRICE-Aprewitt-Availability of Rock-a-Stack toroidal
form.
279 RE:CHEMICAL RESISTANCE OF GREEN FISHING FLOAT TOROIDAL
FORM-Moreland-Availability of large PVC pipe to use for towed fish.
282 PROTON RICH LIQUIDS-A LIST OF POSSIBILITIES-Seppa-Probably 20
or 30 possible proton rich fluids and some notes taken from previous
postings and other sources.
283 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Ginter.
284 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Seppa-
Shuttle for toroid.
285 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Martin-
Shuttle for toroid.
286 METAL DETECTING IN NATIONAL FORESTS - TREASURE HUNTING
NEWSLETTER 7/8/00-Rice.
287 THE ENGINEERING ZONES REFERENCE TABLES-Seppa-MANY detailed
references to scientific, industrial, chemical, electrical,
electronic, etc. data of great use in ANY design or construction
project.
289 RE:THE ENGINEERING ZONES REFERENCE TABLES-Tile- First reference
to "magagnetometer with bottles on ends of long arms" from a
magazine over 20 years old.
292 RE:THE ENGINEERING ZONES REFERENCE TABLES-Moreland-Address for
Carl Moreland's excellent web site.
293 RE:MAG ARTICLE-Martin-Address for Cris Martin's excellent web
site.
295 RE:MAG ARTICLE-Fountain-Probable citation for magazine article
mentioned in posting #290.
296 WEB SITES-Cheriton-Link to web page of Saturn Solutions Ltd.,
that is presently in the process of designing a small marine
magnetometer.
297 RE:2 BOTTLE MAG-Davidson-Information on the two bottle mage
referred to in Posting #289 as well as a citation for the original
magazine article. (This mag will NOT work in South Africa.)
298 NEW MEMBER QUESTION-Alvarez.
299 RE:2 BOTTLE MAGNETOMETER-Smith-Comments about problems with
toroidal magnetometers in South Africa.
300 INDEX TO ALL PREVIOUS POSTINGS-Seppa.
EXTREMELY important web site.
2 INFO I'VE COLLECTED-Duffy-Many web sites, several of which are
VERY important.
5 ANOTHER REPLY FROM JIM KOEHLER-Duffy.
6 MAGNETIC MEASURMENTS HANDBOOK-Duffy.
7 SENSOR DEBATE-Duffy-Koehler & toroid versus solenoid.
8 ELECTRONIC CIRCUIT GUIDEBOOK, VOLUME #1, SENSORS-Duffy.
9 RE: SENSOR DEBATE-Duffy - Fountain.
10 DEPLOYMENT OF SENSORS-Duffy-Dalton, towed sensors, etc.
11 12, 13, 14 & 15: Early thoughts on toroidal forms.
16 RE: DEPLOYMENT OF SENSORS-Fountain-Dalton, towed, etc.
17 RE: TOROIDAL SENSOR-Fountain-Thin wall PVC pipe.
21 USING PVC-Duffy and reply from Koehler on square toroid.
22 PVC TOROID-Duke-Toroid with gap.
23 RE: TOROIDAL SENSOR-Moreland-Square toroid & PVC bending.
24 RE: PVC TOROID-Duffy-Question on Posting 22.
25 RE: TOROIDAL SENSOR-Duffy-Question on Posting 23.
26 RE: PVC TOROID-Duke-Comments on flexible drain hose.
28 RE: DEPLOYMENT 0F SENSORS-Duffy-Dalton range estimates.
29 RE: DEPLOYMENT OF SENSORS-Duke-Cable length.
30 RE: DEPLOYMENT OF SENSORS-Duffy-Cable length, shielding, etc.
31 RE: DEPLOYMENT OF SENSORS-Williamson-Dalton two fish mag, cable
length, etc.
34 RE: DALTON'S MAGS-Williamson-Size of Dalton two-fish mag.
35 MX-500-Duffy-Website and info on towed mag with toroids.
36 HAND-HELD U/W MAG-Duffy-Photos, website & 3-axis sensors.
38 SOME RECENT DISCUSSIONS-Duffy-Fluids, sensors, sensitivity and
shielded cables.
39 PPM PROGRESS-Koehler-Summary of recent developments on Koehler
Proton Precession Magnetometer
(Gradiometer). Request for help on laying out and designing
pc-boards.
40 RE: PPM PROGRESS-Gaboury-Link to www.ivex.com, and others, for
board desirn software and details on his new design company.
41 RE: PPM PROGRESS-Duffy-References to Moreland pages on board
design.
42 RE: PPM PROGRESS-Koehler-More on www.ivex.com PCB
design software and his experience with it and request for help
on producing PB boards.
43 PVC TOROIDS-Fountain-Construction of forms from PVC pipe.
44 RE: PVC TOROIDS-Koehler-Filling forms with hot sand.
45 TOROID FORMS-Barnes-Fisher-Price Rock-a-Stack toroid form.
46 RE: TOROID FORMS-Duffy-Photo of Rock-a-Stack and comments on
larger toroid forms.
47 GEOMETRICS 601-Duffy-three axis sensor, cable length, etc.
48 PATRICK RE DONUTS-Martin-bigger, stronger toroid and "Hall
Effect" sensor UGN3503U.
49 PATRICK RE GEOMETRICS 601-Martin-Comments on problems, sensors
and his web page.
50 RE: GEOMETRICS 601-Smith-Fisher-Price knockoff, multiple
windings, etc.
51 RE: TOROID FORMS-Barnes-Questions for Koehler.
52 RE: PATRICK RE DONUTS-Barnes-Comments on Cris Martin Posting #49
and on "Hall Effect" sensor.
53 ALTERNATE MAGNETOMETER-Duke-Building a mag but wants larger form
as well as comments and questions on flux gate mag. Also gives a
webpage link with sensor data.
54 RE: ALTERNATE MAGNETOMETER-Duffy-Very interesting comment on
construction of Geometrics toroid sensors.
55 RE: ALTERNATE MAGNETOMETER-Smith-Wrecks off coast of South
Africa.
56 RE: ALTERNATE MAGNETOMETER-Moreland-ASIC magnetometer, fluxgate,
Speake, Fat Quarters and web address.
57 RE: ALTERNATE MAGNETOMETER-Carey-Planet Electronics and Shark
Electronics mags.
58 TOROID FORMS-Martin-22 mm plastic plumbing pipe.
60 RE: TOROID FORMS-Koehler-partial reply to early Barnes posting.
61 RE: ALTERNATE MAGNETOMETER-Koehler-Drifting of fluxgate
magnetometer.
63 A BRIEF PROGRESS REPORT-Koehler-Link for update on PPM.
64 RE: A BRIEF PROGRESS REPORT-Duffy.
65 TOROID FORM-Duffy-Info from Foster metal detecting forum on how
to make a circular coil.
68 RE: TOROID FORM-Duffy-Answer to Geary.
70 RE: TOROID FORM-Duffy-More on trucks at 10 feet.
73 RE: A BRIEF PROGRESS REPORT-Duffy-Gives Eric Foster's Metal
Detector website address.
75 RE: TG METAL DETECTING COIL-Martin-Gives web site for technical
information on metal detectors.
76 PVC FORM-Duke-Octagon toroid and temperature question.
78 PIC. FORM AFTER TRIMMING-Duke-After trimming octagon to size.
79 PIC. FINISHED COIL-Duke-Picture of wound octagon coil.
80 PIC. FORM BEFORE TRIMMING-Duke-Before trimming octagon to size.
84 TOROID FORM-Jerry Smith-Info on Irish fishing float for toroid.
85 RE: TOROID FORM-Koehler-Commercial availability of above.
87 PRECESSION VS TEMPS?-Duke-Precession/decay rates & temperature.
88 PROTON LIQUID-Eric-Extract from Archaeology (Oxford) in relation
to hydrogen atoms and relaxation [decay] time.
89 RE: PROTON LIQUID-Duffy-"Wizard" charcoal fluid.
90 RE: PROTON LIQUID-Koehler-Reply to above.
91 MORE EXTRACTS FROM ARCHAEOMETRY-Eric-Ferromagnetic contamination,
paramagnetic qualities of free oxygen, and metal inclusions in
plastic piping.
92 RE: PROTON LIQUID-Duffy-Wizard charcoal starter.
94 RE: PROTON LIQUID-Barnes-Wesson brand salad oil.
97 MAGNETOMETER FLUID-Barnes-Tempone and Overhauser site.
99 SOLID-STATE MAGNETIC RESONANCE SPECTROSCOPY-Ginter.
100 RE: SENSORS-Ginter reply to Barnes OF-Proton precession
frequency, frequency in general, pulse induction units, Gold Bug 2
and Ginter's comments on PI, hot rocks, etc.
109 NEW DOCUMENT-Koehler-Jim's updated PPM document.
110 DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Seppa-Sub zero use
with water as the proton fluid.
111 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Duffy-Good
advice.
112 MY OPINION OF THE DALTON UNIT-Koehler-Detailed analysis of the
Dalton gradiometer by a magnetometer master.
113 RE: MY OPINION OF THE DALTON UNIT-Duffy-Three 3 axis sensors.
115 GEOMETRICS G826A-Rssnk-Unleaded gasoline and Coleman fluid.
117 RE: GEOMETRICS G826A-Duffy-Sensors on 803/826A & towed fish.
118 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Barnes-Website
for sounds and details of his magnetometer design.
119 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Duffy-Barnes unit
for about US$100.
120 RE: MY OPINION OF THE DALTON UNIT-Duffy-Chart recorder for
marine use.
121 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Barnes-Confirming
~$100.00 price for Barnes unit.
122 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Martin-Moreland
design,Fat Quarters Software, web sites, etc.
123 MAG ERROR-Rssnk-G826A alignment.
125 RE: DALTON MAGNETOMETERS & MAGNETOMETER FLUID-Sharp-Comments on
Dalton, Fisher and Geometrics units.
126 DALTON & OTHER GRADIOMETERS/DIFFERENTIAL MAGNETOMETERS-
Seppa-Request for input from Dalton
magnetometer users.
127 RE: DALTON & OTHER GRADIOMETERS/DIFFERENTIAL MAGNETOMETERS-
Duffy-Recommend Barnes CD plans
for mag construction and some comments about Dalton mag.
129 FORM FOR KOEHLER TOROIDAL SENSOR-Seppa-Status of Fisher-Price
Rock-a-Stack toy future availability. [Note - they have
been discontinued but as of VIII/30/00 they are still available.]
130 RE: FORM FOR KOEHLER TOROIDAL SENSOR-Smith-Info on Asian
knockoff of the Fisher-Price Rock-a-Stack available in South Africa
and permeability comments.
131 TWO ARTICLES ON MAGS-Seppa-Citations for 2 articles about
prospecting with magnetometers; one alright and one not so good.
136 RE: TRUCK AT 10 FEET-Moreland-PI board from Eric Foster.
137 RE: FORMS FOR KOEHLER TOROIDAL SENSOR-Seppa-Weighing filled
toroids to verify if there is any loss.
138 DIURNAL & OTHER VARIATIONS - COMPENSATION REQUIRED?-Seppa-
Detailed questions on possible variations.
139 DIURNAL AND OTHER VARIATIONS-Koehler-Detailed information on
variations and the gradiometer.
141 PRECESSION FREQUENCY?-Smith-Question on precession frequency in
South Africa.
142 RE: PRECESSION FREQUENCY?-Koehler-Comment on above.
143 RE: PRECESSION FREQUENCY?-Fraser-Calculation for this question.
144 EUREKA ANOMALY MAGNETOMETERS-Seppa.
145 RE: EUREKA ANOMALY MAGNETOMETERS-Barnes-"That's a pretty steep
price to pay for a Pocket Compass."
146 TOROID SENSOR FORMS-Seppa-Summary of almost all of the Forum
Postings which have touched on this subject.
147 RE: TOROID FORM-Jerry Smith-Nice photo of the Irish Commercial
Fishing Float of about 8 inch outside diameter.
148 RE: TOROID SENSOR FORMS-Koehler-General information on toroids.
149 SENSORS-Rssnk-Geometrics 826A performance.
150 RE: SENSORS-Williamson-Questions of Geometrics 826A.
153 MORE TOROID FORMS!-Barnes-Gerber toroids and some comments on
proton rich fluids.
154 RE: TRUCKS AT 10 FEET AND NEW MAG ON THE
BLOCK?-Seppa-Information on CST ferrous object finder and the Fisher
FX-3 differential induction magnetometer.
155 PRECESSION FREQUENCY- WRITE IT DOWN-Barnes-Shows the frequency
of proton precession of 42.5743751 Mhz per Tesla and additional
information.
156 RE: TRUCKS AT 10 FEET-Moreland-Air test of his fluxgate.
157 MAGNETIC METHODS USED IN PROSPECTING-Seppa-Near complete text
of magnetic method section of USGS book.
158 COST OF OVERHAUSER GRADIOMETER POS-2 FROM QMLAB-Seppa-Link.
159 POSSIBLE COATINGS FOR TOROIDAL FORMS AND COILS???-Seppa.
163 RE: HELP-Seppa-Some basic advice for new members.
167 RE: MAGNETIC RESEARCH, INC.????-Whitney-He bought the book from
them and likes it.
169 TOROIDAL COIL FORMS-Seppa-Availability of forms.
170 RE: TOROIDAL COIL FORMS-Fraser-Non-magnetic metal for forms.
171 MAGNETIC ANOMALIES, ETC.-Dewhurst-Questions, answers and
Jalander fluxgate magnetometer.
172 NON-MAGNETIC METAL CASES-Strout-Sources.
173 NON-MAGNETIC METAL CASES-Strout-Interesting comments on tapes
used to wrap toroids.
174 MAGNETIC ANOMALIES, ETC.-Vizmuller-Interesting plans for
building sensors for fluxgate magnetometers/gradiometers and also
a novel way of energizing the earth to increase the magnetic field
of buried objects. Also offers cores and gradiometer schematic and
parts list for a flux-gate gradiometer.
177 PROTON RICH SUBSTANCES REVIEWED & SOME UNANSWERED QUESTIONS
-Seppa.Reshash of Posting #88
and items from Koehler manuscript.
178 RE: PROTON RICH SUBSTANCES REVIEWED & SOME UNANSWERED
QUESTIONS-Dewhurst-Suggestion as to
why hydrogen rich solids will not work in PPMs.
179 WESSON SALAD OIL-Seppa-Comments and questions on the several
different types of "salad oil" produced by Wesson.
183 WESSON OIL-Barnes-His contact is no longer on this plane and
Ketchup bottles as solenoids.
185 RE: TEMPONE-Barnes-Phil's reiteration of the information that
he had been able to find on Tempone.
189 ERIC, ET AL - EFFECT OF FREEZING ON PROTON RICH FLUIDS?-Seppa.
191 MATERIALS FOR LIQUID FILLED COIL FORMS-Seppa-Quotes and
questions.
192 PROTON SOURCES-Kirby-Question on Hydrogen gas.
193 RE: PROTON SOURCES-Boetzkes-Answers above question.
194 ROB CURRELL, ET AL.-RE EFFECTS OF FREEZING-Seppa-More on
various liquids and solids, para magnetic free oxygen, alcohols,
etc.
195 LEE FRASER, ET AL.-RE: TOROIDAL COIL FORMS-Seppa-Questions on
shielding of toroids with aluminium foil.
198 RE: LEE FRASER, ET AL.-RE: TOROIDAL COIL
FORMS-Fraser-Electrostatic shielding and some comments on fluids.
199 DALTON MAGNETOMETER REVIEWED-Seppa-Most of the details from the
review in a national treasure hunting magazine.
202 GSM-19 OVERHAUSER SYSTEM MAGNETOMETER-Seppa-Web site link.
203 RE: DALTON MAGNETOMETER THEORY-Davidson-Question on Dalton beat
frequency.
205 RE: 1 Hz BEAT SOUNDS REVEALED-Barnes-Information on how to
actually hear the beat sounds on Phil's website.
206 RE: GSM-19 OVERHAUSER SYSTEM MAGNETOMETER-Smith-Comments on
distilled water, de-oxigenization, Overhauser and Tempone.
207 RE: DALTON MAGNETOMETER THEORY-Kirby-Comments on beat
frequency.
208 RE: DALTON MAGNETOMETER THEORY-Koehler-Comments on beat
frequency and question about the Dalton magnetometer.
209 DALTON-LIEBHAZET 3 MAG-Seppa-Answer to above question.
210 RE: 1 HZ BEAT SOUNDS GOOD-Davidson-Thanks to Phil for sound and
comments on BFOs and PIs.
211 S.A. MAGNETIC FIELD, AQUASCAN, TOROIDS, PROTON FLUID, GPS,
DGPS, ETC.-Seppa from George Davidson.
212 COPPER WIRE CONTAMINATED WITH FERROUS MATERIALS-Seppa.
213 FERROUS CONTAMINATION OF COPPER WIRE AND PLASTIC-Seppa.
215 TEMPONE AS A PROTON RICH LIQUID-Seppa.
217 USEFUL PAGE-Fraser-Link to Geometrics and recommendation for
the "Applications Manual for Portable Magnetometers."
219 RE:-Koehler-Giving site address for construction plans in
answer to new members.
220 IMPROVED GPS ACCURACY-Seppa.
221 INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Seppa.
223 MAGNETIC FIELD THEORY AND BASIC CONCEPTS-Seppa-Link to 9 slides
with outline of university lecture on subject shown.
224 OVERVIEW OF ALL TYPES OF MODERN MAGNETOMETERS-Seppa-Link.
225 ELSEC 7706 MARINE PROTON MAGNETOMETER-Seppa-Link.
226 RE:INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Fraser-Gives
link to Geometrics publications and the opening of the discussion on
bifilar windings.
227 RE:INDEX TO THE FIRST 220 POSTINGS TO THIS FORUM-Kirby-Comments
on Fraser's bifilar document.
228 APPLICATIONS MANUAL FOR PORTABLE MAGNETOMETERS-Seppa-Link to
this excellent (58 page) document, courtesy of Lee Fraser.
233 RE:-Duffy-Link to oxygen analyzer device description.
234 BIFILAR WINDINGS-Kirby.
237 DICTIONARY OF TECHNICAL TERMS FOR AEROSPACE USE-Seppa-Link.
238 PARAMAGNETIC QUALITIES OF FREE OXYGEN-Seppa.
250 BIFILAR WINDINGS-RECAP OF RECENT POSTINGS #s 226 through # 248
(Latter by Jim Koehler.)
256 GRADIOMETER CIRCUITS ARE NOW AVAILABLE-Koehler-Link for circuit
drawings for Koehler's single sensor and dual sensor magnetometers.
Also links for his detailed manuals.
257 DETECTION DISTANCES FOR ELSEC RECORDING PROTON MAGNETOMETER
7706-Seppa.
258 SHARK ELECTRONICS WEB SITE-COURTESY OF BOB CAREY-Seppa.
264 RE:MAGNET SELECTION HELP NEEDED-Martin-Magnetism of pins on
microprocessor chips and info on gauss/tesla relationship.
267 CHEMICAL RESISTANCE FOR GREEN FISHING FLOAT TOROIDAL
FORM-Seppa.
268 RE: TESTS FOR MAGNETIC MATERIALS-Davidson-Detailed method of
determining magnetic buildup. Makes an interesting point about
selecting the "least offensive" of the various materials.
269 RE:HDZF-Aprewitt.
273 RE: TESTS FOR MAGNETIC MATERIALS-Martin-Comments on his magnet
with a strength of 3500 gauss and five links with information.
274 RE: TESTS FOR MAGNETIC MATERIALS-Eric-Comments on magnetic
impurities in copper wire and other materials.
275 RE: TESTS FOR MAGNETIC MATERIALS-Boetzkes-Detailed (3 pages)
explanation of magnetic fields in general to include diamagnetic,
paramagnetic and ferromagnetic materials. VERY important for
conceptual understanding.
276 RE:FISHER PRICE-Aprewitt-Availability of Rock-a-Stack toroidal
form.
279 RE:CHEMICAL RESISTANCE OF GREEN FISHING FLOAT TOROIDAL
FORM-Moreland-Availability of large PVC pipe to use for towed fish.
282 PROTON RICH LIQUIDS-A LIST OF POSSIBILITIES-Seppa-Probably 20
or 30 possible proton rich fluids and some notes taken from previous
postings and other sources.
283 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Ginter.
284 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Seppa-
Shuttle for toroid.
285 FISHER-PRICE ROCK-A-STACK, HELICAL-TOROID COIL, ETC.-Martin-
Shuttle for toroid.
286 METAL DETECTING IN NATIONAL FORESTS - TREASURE HUNTING
NEWSLETTER 7/8/00-Rice.
287 THE ENGINEERING ZONES REFERENCE TABLES-Seppa-MANY detailed
references to scientific, industrial, chemical, electrical,
electronic, etc. data of great use in ANY design or construction
project.
289 RE:THE ENGINEERING ZONES REFERENCE TABLES-Tile- First reference
to "magagnetometer with bottles on ends of long arms" from a
magazine over 20 years old.
292 RE:THE ENGINEERING ZONES REFERENCE TABLES-Moreland-Address for
Carl Moreland's excellent web site.
293 RE:MAG ARTICLE-Martin-Address for Cris Martin's excellent web
site.
295 RE:MAG ARTICLE-Fountain-Probable citation for magazine article
mentioned in posting #290.
296 WEB SITES-Cheriton-Link to web page of Saturn Solutions Ltd.,
that is presently in the process of designing a small marine
magnetometer.
297 RE:2 BOTTLE MAG-Davidson-Information on the two bottle mage
referred to in Posting #289 as well as a citation for the original
magazine article. (This mag will NOT work in South Africa.)
298 NEW MEMBER QUESTION-Alvarez.
299 RE:2 BOTTLE MAGNETOMETER-Smith-Comments about problems with
toroidal magnetometers in South Africa.
300 INDEX TO ALL PREVIOUS POSTINGS-Seppa.
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