This was our calculator! Amazingly, you could get really good at making complicated calculations quickly. You just had to keep track of your exponents. They were based on logarithms, so there were lots of options.

Modern Antiques That Today’s Kids Probably Have Never Used

This was our calculator! Amazingly, you could get really good at making complicated calculations quickly. You just had to keep track of your exponents. They were based on logarithms, so there were lots of options.

Vintage German Slide Rule Darmstadt. No. 21. Albert Nestler A.

Vintage German Slide Rule Darmstadt. No. 21. Albert Nestler A. G. LAHRI/B

Vintage German Slide Rule Darmstadt. No. 21. Albert Nestler A.

FISHER PICKETT ©1954 Aluminium Control Valve Sizing Slide Rule, w/ Slip Case

Details about FISHER PICKETT ©1954 Control Valve Sizing Slide Rule, Slip Case & Instructions

FISHER PICKETT ©1954 Aluminium Control Valve Sizing Slide Rule, w/ Slip Case

Last slide rule manufactured, July 11, 1976 | EDN

Last slide rule manufactured, July 11, 1976 | EDN

FOXBORO-YOXALL Valve Sizing & Flow Slide Rule, Instructions, With Leather Case

Details about FOXBORO-YOXALL Valve Sizing & Flow Slide Rule, Instructions, With Leather Case

FOXBORO-YOXALL Valve Sizing & Flow Slide Rule, Instructions, With Leather Case

MASONEILAN/ ANNIN Cv (Control Valve) Calculator Flow Slide RuleS, Red Slip Case

Details about MASONEILAN/ ANNIN Cv (Control Valve) Calculator Flow Slide RuleS, Red Slip Case

MASONEILAN/ ANNIN Cv (Control Valve) Calculator Flow Slide RuleS, Red Slip Case

Vintage German Slide Rule ARISTO. 967U. Plus

Vintage German Slide Rule Darmstadt."ARISTO". 967U. Plus Plastic Ruler. Original Instructions for use Booklet. Dated 1963

Vintage German Slide Rule ARISTO. 967U. Plus

Types of slide rules by CatMadePattern on @creativemarket

Types of slide rules

Types of slide rules by CatMadePattern on @creativemarket

1951 SLIDE RULE Print Advertisement DIETZGEN by phorgotten

1951 SLIDE RULE Print Advertisement • DIETZGEN Antique Slide Rules • 1950s Retro Advertising • Black & Orange Wall Decor • 50s Science Ad

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