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AllAboutSlideRules_OughtredSocietyPublication_rev121001
AllAboutSlideRules_OughtredSocietyPublication_rev121001
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Chapter Five - Less Common Types of Slide Rules 33CharpentierCalculimetre,60 mm(2 3 /8”)diameter, metal, France,1882+Some Rare Circular Slide Rules which are Popular with CollectorsCharpentier Calculimetre (metal, France)Dempster Rotarule (plastic, USA)Boucher Calculigraphe (pocket watch type: France, Germany, Englandand USA)Fowler (pocket watch type, England)Halden Calculex (pocket watch type, England)Lord’s Calculator (pocket watch type, England)Sperry (pocket watch type, USA)Small Calculator (USA)