K e slide rule dating

This ten-inch mahogany two-sided linear slide rule is coated with white celluloid and held together with L-shaped metal end pieces.

On one side, the base has K, DF, D, and L scales, with CF, CIF, CI, and C scales on the slide. The bottom of the base is marked in red: KEUFFEL & ESSER CO.

These slide rules were purchased from retail stores or distributors or from collectors who bought them from a retail store or distributor.

They have been unsold on store shelves for 35-40 years and the boxes show shelf wear.

Four-inch closed-body bamboo slide rule with magnifying cursor.

Scales are A [B, CI, C] D and [S, L, T] plus a 10-cm measuring scale on the top edge. Scales are L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 and Sh2, Sh1, Th, A [B, TI2, TI1, SI, C] D, DI, chi, theta.

The Reverend William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier.

The top of the flap is marked: K & E (/) LOG LOG DUPLEX (/) SLIDE RULE. For information on the patents, see MA*322761, MA*318475, and MA*318479.On the other side of the base, there are LL01, L, K, A, D, DI, and LL1 scales, with B, T, SRT, and S scales on the slide. The left end of the top and the bottom of the base are both marked: 858. The indicator is glass, with white plastic edges held together with metal screws. (New York, 1936), 318–319; Ed Chamberlain, "Estimating K&E Slide Rule Dates," 27 December 2000, e_date2 The serial number on this example is consistent with a manufacture date between 19, but the indicator is of the pre-1936 style. References: K&E Slide Rules and Calculating Instruments (New York, 1922), 10–11; K&E Slide Rules and Calculating Instruments (New York, 1925), 10–11; Catalogue of Keuffel & Esser Co., 38th ed.The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms and trigonometry, but typically not for addition or subtraction.Though similar in name and appearance to a standard ruler, the slide rule is not meant to be used for measuring length or drawing straight lines. Patent 2,422,649 issued June 17, 1947); Herschel Hunt, "Slide Rule" (U. Patent 2,500,460 issued March 14, 1950); Clark Mc Coy, "Collection of Pages from K&E Catalogs for the 4081-3 Family of Slide Rules: 4080-3 & 4081-3 Family Groups," Ed Chamberlain, "Estimating K&E Slide Rule Dates," 27 December 2000, e_date2.jpg; K E Price List, Applying to the 42nd Edition Catalog (Hoboken, N. All Rules - Acu-Math - Aristo - Bruning - Concise - Dietzgen - Faber-Castell - Hemmi - Hughes-Owens - Keuffel & Esser - Lutz - Pickett - Post - Relay/Ricoh - Royal - Sans & Streiffe - Sterling - Unique - W & G There are a number of sources of manuals for slide rules, they were usually supplied with slide rules when purchased although over the years they have become detached from the slide rule and are now lost.However, 35-40 years of storage have effect even on slide rules in sealed plastic bags: The metal end brackets have dulled; the stators are usually out of alignment and some grit has deposited the celluloid surface.The rules can be returned to 1970 condition with a wipe-down of Windex and metal polish on the end brackets.

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