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30All About Slide RulesAristo 1067U, 50 cm(20”) scales, plastic,GermanyOther Less Common Types and the Quest for Greater PrecisionSeveral types of slide rules were developed to obtain greater precision. Mostof them are somewhat scarce today. Among these are:Pickett 1010ES, 25 cm,aluminum, USA, alongwith Pickett ClassroomDemonstration SlideRule, Model 1010-ES,100 cm scales, paintedwood, USA. [Pet cat usedas size comparison wasmade Reference Manualmascot in lieu of modelingfees.]• 20” scale length linear slide rules, made in both closed body and duplextypes.• 5” or 10” or 20” slide rules with scales split into double or triple lengths.• Both 5 and 10 inch rules were sometimes fit with a magnifying cursor toenable precision approaching a 10 or 20 inch rule.• Circular slide rules with spiral scales... the Gilson Atlas, an 8" diameterrule with scales 25 feet and 50 feet long, and others.