|Title||Slide rule, Polyphase (Mannheim), N4053-3, 10", made by Keuffel & Esser Co., N.Y. ca. 1945-1950.|
|Object Name||Rule, Slide|
|Collection||Keuffel & Esser Company Collection|
|Credit||Museum Collections. Gift of a friend of the Museum.|
Polyphase (Mannheim type) 10" slide rule, N4053-3, made by Keuffel & Esser Co., (New York), no date, circa 1945-1950. Mahogany, machined and laminated; with laminated white celluloid plastic ruled ("engine divided") scales in red and black; bottom edge has laminated centimeter rule; top front edge beveled with laminated white celluloid ruler, English measure by inches and sixteenths; 10-5/8" overall length x 1-5/16" high x 3/8" thick. Indicator original. Back has an inset printed table of settings, formulas and ratios.
Serial number 345627 which appears on the left end of back slide back and on theleft end of centimeter rule on bottom.
With: black leather hard case (sheath) blind stamped on top, "Polyphase. Reg. U.S. Pat. Off."; two separate blindstamps on closure flap: "4053-3" plus "K & E" on tongue. Original paper covered cardboard slipcase box with printed paper label on end of tray.
While tentatively dated as 1945-1950, it may be possible to narrow this to 1947-1948 based on the serial numbers of dated slide rules listed on various websites.
Scales on front marked at the right:
A, B, CI, C, D, K.
With slide inverted: A, S, L, T, D, K (note S, L, T scales are marked on right end of slide.)
Model number is on left end of slide front with K&E logo at right end. Engraved on stator front at top left with company name, "Keuffel & Esser Co."; at top right, "Pat. 1,934,232, Made in U.S.A."
Indicator is improved metal framed type with "Patent 2,086,502" on top and "Keuffel & Esser Co., N.Y.", on bottom.
Conversion table on back is U.S. Bureau of Standards "Circular No. 47."
K&E had their main office and factories in Hoboken when this item was made.
|Year Range from||1945|
|Year Range to||1950|
K & E
Keuffel & Esser Co.
|Caption||front with model number at left; scales A, B, CI, C, D, K.|
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