Reply to Terence Geary

[Randy Seden]

>Thanks for the info, Randy. I'm currently working on the flux gate mag and am about to try out an iron-on transfer method of making PCB's. I'll post a write-up on this if it works well as it will let you make prototype boards for a couple of bucks each.


>- Carl


Will the fluxgate magnetometer be sensitive enough to detect the presence of a black magnetite deposit in a stream? I would rather build a fluxgate than a proton magnetometer with the twin water bottles.


Randy Seden


Simi Valley,Ca.

[Randy Seden]

Re: More on PCBs

>Thanks for the info, Randy. I'm currently working on the flux gate mag and am about to try out an iron-on transfer method of making PCB's. I'll post a write-up on this if it works well as it will let you make prototype boards for a couple of bucks each.


>- Carl


Will the fluxgate magnetometer be sensitive enough to detect the presence of a black magnetite deposit in a stream? I would rather build a fluxgate than a proton magnetometer with the twin water bottles.


Randy Seden


Simi Valley,Ca.

[Dale Seppa]

Reply to Terence Geary

Terry:


I can only give you a few opinions which is not too important as I


am sure you will get better ideas from others on this forum.


Firstly I think your query is OT (Off Topic) to the best of my


limited knowledge on the subject. To my knowlege Magnetometers were


NOT used during or shortly after WWI because they would have been


very expensive AND to my knowledge they were not very highly


developed with the possible exception of huge units used in


submarines, etc.


I am certain that MOST (if not all) of the devices used for finding


mines were crude metal detectors using electromagnetic induction as


opposed to the principals which make a mag go.


Therefore in my opinion you will be better off on a Metal Detector


Forum.


Based on what you say you are looking for I would (if it were me)


select on of the currently manufactured "two-box" detectors. There


are about five of them. According to one review that I saw the best


for your purpose would be the Discovery TF-900 which is good down to


20 feet for an automobile size object. However, remember that if


the soil is heavily mineralized that depth is cut down to maybe


half.


Second guess would be the HAYES DS-7 Deep Search SUPER because with


their handle extension they ADVERTISE down to 28 feet. Personally,


I do not like them as well.


Shoestring? depends on how big a shoes string. These units are


$400 to $600 new and used about 2/3 that price if in real nice


shape. For what you are looking for I would not look for anything


cheaper. A good commercially produced mag would cost at leastt


$6000 so you are geting a lot of bang for your buck.


I would suggest you find a local detectorist who is willing to check


your site and see how bad mineralized the soil is as that will have


something to do with your selection process.


best,dale


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Virginia, MN 55792 USA