|Title||Slide rule, Polyphase Mannheim, 68 1608 (formerly 4053-5), 20", made by Keuffel & Esser Co., N.Y., n.d., ca. 1962-1967.|
|Object Name||Rule, Slide|
|Collection||Keuffel & Esser Company Collection|
|Credit||Museum Collections. Gift of a friend of the Museum.|
Polyphase (Mannheim Type) 20" slide rule, 68 1608 (formerly 4053-5), made by Keuffel & Esser Co., New York, no date, circa 1962-1967. Mahogany, machined and laminated, with laminated white celluloid plastic ruled ("engine divided") scales in red and black; 21-5/8" overall length x 1-5/8" high x 3/8" thick. Indicator (cursor) is improved glass, no patent numbers or maker's markings. With: dark green leather case (sheath.)
Date of this item is derived from information on the website of Clark W. McCoy with gratitude for his efforts.
K&E logo on front slide at right end; model number at left end of slide.Slide inverts; serial number is at left end of slide, 950007. Back has the printed table of equivalents which is lacking the first inch at the left where a second K&E logo should appear.
Scales are on the front:
A, B, CI, C, D, K
Slide inverts for scales:
A, S, T, L, D, K (note that the scales S, T and L are marked on the right end of the slide.)
Bottom edge is a centimeter scale divided to millmeters. Top edge is beveled with an inch scale divided in sixteenths.
K&E had their main office and factories in Hoboken when this item was made.
|Year Range from||1962|
|Year Range to||1967|
K & E
Keuffel & Esser Co.
Business & Commerce