Archive of Collections

Archive of Collections

Details and Image

Item#	Type	Model No.	Match No.	Variant No.	Model Name	Maker	Country	Production or Serial No.	Material	Scale Length	Date	Condition
KEU658	Linear	4075	4198	n/a	Duplex w/2 Slides	Keuffel & Esser	USA	15	Engine divided celluloid laminated mahogany	"10"	1901	C5

Notes: "Early duplex slide rule with interchangeable slides. Chisel tooth metal indicator. One slide has trig scales on reverse and the other has inverted scales. All scales labeled on right hand side and has KEUFFEL & ESSER Co. NEW-YORK on obverse and PAT. OCT. 6. 1891 on reverse, both below D scale between 2 and 3."

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