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Old 08-06-08, 07:56 PM   #6
Puster Bill
Grey Wolf
 
Join Date: May 2006
Location: BA8758, or FN33eh for my fellow hams.
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It's not quite historical, but you could make a bearing rate computer. It's a circular slide rule that was used in the 1950's-1980's to do the calculations.

Here is the inner wheel:



And here is the outer wheel:



The parts where it looks messed up are the parts where I had to erase the "cursor" on the illustration (I pulled it from a navy manual online somewhere). You can clean it up if you want, but it works fine as-is.

Obviously, you print them out and then make a cursor for them, then pin it all together in the center.

I don't have the instructions handy, but if you google "bearing rate computer" you should find it. The procedure does work, but I don't do it anymore because it isn't historical (at least, not WWII German historical).
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