Pulse Induction History and Theory

[mikebg]

I made with OCR a txt file for machine translation of the article mentioned in post #69

http://www.e-corpus.org/notices/86284/gallery/1301708

The results of machine translation from French to English is bad.

Let somebody, who knows better than me both languages, make the translation. Here is the OCR generated file:

[mikebg]

OTHER ANCIENT METAL DETECTOR

Académie des sciences (France)
CHIRURGIE. Sur l'emploi de la balance d'induction de Hughes pour la
recherche des projectiles dans le corps des blessés. Note (1) de M. A. de la
Baume Pluvinel, présentée par M. G. Lippmann.
_____________________________
(1) Séance du 20 septembre 1915.

Academy of Sciences (France)
SURGERY. On the use of the induction balance of Hughes to
search projectiles in the body injured. Note (1) Mr. A. de la
Baume Pluvinel, presented by Mr. G. Lippmann.
_____________________________
(1) Meeting of 20 September 1915.

Here is the OCR generated txt file for machine translation:

[mikebg]

PUBLICATION IN NEW ZEALAND

Publication in New Zealand
Ashburton Guardian, Volume XXXV, Issue 8353, 21 January 1916, Page 8

http://paperspast.natlib.govt.nz/cgi...G19160121.2.38

Attaced is an OCR generated file.

[mikebg]

UXO detector Gutton 1915

Below is attached the first official description of UXO detector GUTTON 1915 which circuit diagram is given above:
http://www.geotech1.com/forums/showt...191#post167191
The attached file was made by OCR from a publication of the French Academy of Sciences

http://gallica.bnf.fr/ark:/12148/bpt...image.r=gutton
http://gallica.bnf.fr/ark:/12148/bpt...image.r=gutton
http://gallica.bnf.fr/ark:/12148/bpt...image.r=gutton

The text is divided in paragraphs to edit the machine translation, but the results of machine translation from French to English is bad. Let somebody, who knows better than me both languages, make the translation. Here is the OCR generated file:

[Ferric Toes]

High Power PI still in use after 32 years

Not quite so ancient, but a pure PI built in 1981 for Mel Fisher in his search for the "big pile" of silver bars on the 1622 Atocha wrecksite off the coast of Florida. This detector can pulse 50A through a large coil towed on a sled along the sea bed. The detector electronics was housed on a survey boat along with its associated chart recorder. Power was 48V from marine lead acid batteries. Short delays were not necessary as the TC of a single bar was several milliseconds, and there was plenty of signal at the 250uS minimum delay on the switch. Sea water response was also minimised by this.

This unit is still being used by the present owner, who was also involved in the Atocha search, and I will be furnishing him with some coil details.

Many thanks to Mikebg for helping to re-establish this contact between the owner and myself.

Eric.

[satdaveuk]

Thank Eric
This is so interesting right up my street, shall print all these off and keep them forever.
Many many thanks

[Ferric Toes]

Thank Eric
This is so interesting right up my street, shall print all these off and keep them forever.
Many many thanks

Well it arrived back today after 32 years away. Looks like it will need some TLC but I gather it still works and inside looks good. Here are some pictures taken at the time in my Irish factory where it was made. I think I need an overhall too. Was my hair really that colour?

Eric.

[Altra]

These photos are great. A pioneer in pulse induction and electronic shipwreck recovery.

You probably had your hands in this also

[Ferric Toes]

Well it arrived back today after 32 years away. Looks like it will need some TLC but I gather it still works and inside looks good. Here are some pictures taken at the time in my Irish factory where it was made. I think I need an overhall too. Was my hair really that colour?

Eric.

Not too bad inside. The 22,000uF TX reservoir cap dominates the scene, with big heatsink for 2N5883 driver and PT7505 80A power transistor behind (no mosfet power then). Heat extraction fan at right end of HS. Relay is to charge capacitor up slowly in standby position on front panel switch (avoids melt down of switch with 50V supply). Pulse generator and sample generator board to the right, and RX to the left.

Eric.

[sinclairuser]

Nice pics, a true work of art (real electronic art!).

Obviously built to last!.

[Baterista]

Very powerful, this is a prototype?, or other were produced.

[Ferric Toes]

Very powerful, this is a prototype?, or other were produced.

This is the only one in the world. It was originally built for a specific purpose - to find silver bars from the Atocha. It has been used for other searches since that time, but I do not have any details.

Eric.

[Baterista]

This is the only one in the world. It was originally built for a specific purpose - to find silver bars from the Atocha. It has been used for other searches since that time, but I do not have any details.

Eric.

Thanks Eric, for the pics and information. I think this machine is playing the role of treasure.

[sido]

This is the only one in the world. It was originally built for a specific purpose - to find silver bars from the Atocha. It has been used for other searches since that time, but I do not have any details.

Eric.

Why was there only one built??.....Sure other treasure hunters would of been after something similar in its day.
You never kept any design schematics?

[Ferric Toes]

Why was there only one built??.....Sure other treasure hunters would of been after something similar in its day.
You never kept any design schematics?

I'm sure other treasure hunting groups would have liked one, but Mel Fisher wanted the edge over others and one machine was part of the agreement. I did make a lower power version that ran off 24V and quite a few of those were sold. Ironically I threw out most of the manufacturing information a couple of years ago, thinking it would never be needed again. Luckily I found a few notes and part schematics in a notebook that escaped the purge. Picture of 24V AQ.

Eric.