Might be a K&E log log desi trig (trig scales were decimal degrees) I bought one (used) for college in the late fifties. Came with the usual K&E brownsbaltermedphys
I think that it's certainly a K&E. It might be a 4081-3, but it could be an earlier rule such as a 4091-3 or 4092-3. Depends on when he bought it. Since hemngwright
Be careful if you remove the screws in the back, it is fiddly to put back together. Sent from my iPhone
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Slide rules are THE ORIGINAL solar powered calculators. Try using one in the dark and you'll see I'm right, or not see as the case may be.
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- Dec 21, 1998
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