5 posts in this topic
By Steve Herschbach
Before Carl Moreland was Engineering Manager at White's Electronics (and now First Texas), he created a website that has more technical information on metal detectors than any I know of. The Geotech website has lots of interesting stuff and in particular it has a lot of "build your own" metal detector projects for the electronically minded. I have never done this myself but if you were ever curious about what makes detectors tick a lot can be learned here.
George Overton & Carl Moreland, co-admins for the Geotech web site, also wrote the new book, Inside the Metal Detector. This is not another "how to use a metal detector" but rather a look inside to the operating principles and electronics that make a detector work.
Inside the Metal Detector explains theory and offers numerous experiments and projects that demonstrate the theory. You can build an off-resonance pinpointer, a GEB-discriminator, and a microprocessor-controlled PI detector. Even if you're not inclined to build a detector, the concepts learned from ITMD will help you better understand how your own detector works and what all those controls are really doing. The book can be purchased as paperback or Kindle format on Amazon
Quoted from EZMoney Bob's post on Talk On "Engineering Marvels Of The Comstock":
"Something I just learned about engineering on the Comstock is that in 1890 or so a hydroelectric plant was installed at the 1650 foot level of the Chollar Mine. It was powered by high pressure water piped from the surface to Pelton wheels at the 1650 foot level. The electricity was delivered back to the surface where it powered a mill. At the time of installation it was the world's longest electric power line with a length of over one mile. There was some discussion today about whether the generation equipment is still down there at 1650 feet. The conclusion was that it's a moot point because the water level in the mine is at about the 1300 foot level."
Here is an interesting article & video footage of the remains of the Hydro plant & stamper battery set up that was built in 1886 in the most rugged & inhospitable place imaginable way up in the mountains in Bullendale, Skippers, New Zealand. Footage will also give you a glimpse of the type of country I get in to in my quest of detecting for gold. Enjoy.
And this shows a bit of interesting local gold history & the Bullendale power site.