1943 Derick Trigonometry Simplified Circular Slide Rule & Drill Gauge Dial

Description

At 76, I’m a retiring antique dealer who is beginning to clean out his stock of stored treasures.
I’m not sure if these two items qualify as “slide rules” or not, but certainly they help the user figure “Trigonometric Functions.”
And the second seems to be about drills and drilling.
Buyer to receive both (with the book that accompanied the trig one) and pay shipping within the United States.
Happy to combine shipping on multiple purchases when possible. Due to ebay policies, I reluctantly have a “no returns” policy, so look closely at photos and ask questions first.
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