Jarvis Tap Selector Calculator Slide Rule
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This is a very nice vintage slide rule type calculator, design to give the user a choice of tap and drill sizes, and also drill depth calculator. It also has some other charts for various type of lubricants for various material applications. Simple to use, in very good used condition, with very little wear. It is marked "JARVIS CORPORATION MIDDLETOWN CONNECTICUT TAP SELECTOR" and is dated "SLIDE CHART CORP 1956 by PERRYGRAF CORP.". It is 7" long overall. It is made of a plastic coated heavy paper and is very durable. We generally have many different types of slide rules, and slide rule calculators in stock. Many of these calculators have become rare, and very collectible!
- Reference #
- Jarvis Corp. Middletown CT. U.S.A.
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- Very Good