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Chapter Three - History of the Slide Rule 19EpilogueThe philosophy of engineering moves on. And the triumphs of 20 thCentury design become limitations for the slide rule. Einstein favors aNestler slide rule in his work. The approaches to the Golden Gate Bridgeand the thrust profile of the Redstone Rocket are designed with simple Rietzbased slide rules ... E.H. Lowry’s Dietzgen Phillips 1725 and Wernher VonBraun’s Nestler 23 respectively. Pickett slide rules provide emergency computationalpower aboard Apollo missions with their N600-ES model. ThePickett N3 and N4 take their places along with the K&E Decilon and thePost Versalog in designing the F16 fighter airplane.Hemmi 259D, 25 cmscales, celluloid onbamboo core,duplex, Japan.Front view.Golden Gate Bridge,San Francisco
20All About Slide RulesBut structural design and first principles in physics both seek answers tohow structures will react to changing loads and forces. Wind speeds, tidalfriction and interstellar collision all require dynamic computational models,rather than the answer to a static structural problem.Large, slow, obese computing engines designed for these questions givebirth to the sleek four-function calculator. K&E’s travails with its Analonslide rule model are an excellent example of the change in engineeringdemands that surpassed the slide rule.The four function electronic calculator is a symptom as much as a causeof this change.F-16 Fighterairplane, USADietzgen 1732Maniphase Multiplex, 25cm scales, celluloid onmahogony core, duplex,USASlide rule researchers have estimated that possibly 40 million slide ruleswere produced in the world in the 20 th Century alone. Among these aremany types of specialty slide rules developed and made for specific applicationssuch as chemistry, surveying, electricity and electronics, artilleryranging, hydraulics, steam and internal combustion engines, concrete andsteel structures, radio and other special fields.The slide rule has a long and distinguished ancestry, from WilliamOughtred in 1622 to the Apollo missions to the moon ... a span of three and ahalf centuries ... it was used to perform design calculations for virtually all
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