So, I know I havent posted in the forum in a long time, (but I still visited whenever I could) The reason for this is that I'm nearly at the end of my college years, and it has benn one bumply ride.
So, this been the final year, we students must make a final job, in which we are assigned a 15 Km square area, at randon, and we must use all our skills to generate a report.
In my case, I got sent to the middle of nowhere, but It's a great place to study hidrology (and that is what my report is focussed on). The only Little problema is that the are no wells... not one, not even to water the local cattle.
Many people would ask for a change, but not me...I have to plow on. I can still do it, no problema, it's just a bit harder (Which in turn means greater scores)
So, What am I rattling on about?? I was asking for help! And I am!
In order to study the underground water resorces, I turned to geophysics, specifically
Resistivity Methods. For those who wonder, this consist in essecially sending an electric current into the ground, and messuring the resistivity of rocks. It's pretty neat, cheap, and usefull.
However, today the equipment for such Jobs is mighty expensive, and I thought, "Hey, I'll just Build my own machine" And so I dug out to old books from the library which contained almost all the info I needed.
SO, to cuild this contraption, I need:
Power source: Batteries, ranging from 45 to 90 V, using d.c current.
Milliameter: a range from 5 to 500 mA should do the job, but I would like it to "Shunt", to give me a bit of extra messuring habilities.
Voltimeter: need one with high input impedance (1 Megaohm or better) with a range of 10 mV to 20 V
To cap it all off, a rheostat, for different voltaje outputs.
Then comes the extra equipment, electrodes and reels of wire. This I already have.
I know what everything is, and how it works, but I really dont know how to put it toghether. I've tried a couple of electronic hardware stores, but either they dont know how to build it, or they tell me I need to give the an exact list of what I want.
Can someone help? Apaart from what I listed, what else do I need, and how do I build a rheostat (apparently, nobody sells them anymore)??
I'm really stuck here, and I dont want to give up, but I do have to turn this job in by June, and it's a large area to study.
I'm adding a graphycall description of what it all looks like, plus a photo.
Help me MacFans!! My sanity is at stake!! (not to mention my future, but no pressure
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In my oppinion, Graham Bell has a lot to answer for. It gets harder and harder to escape from the world, the news and worst of all, people.
