Keuffel & Esser 1621P Architects' Triangular Scale

Description:

This 12-inch triangular boxwood rule has indentations along each side, and the sides are faced with white celluloid. On one side, one edge has a scale divided to 1/16" and numbered by ones from 0 to 12. The other edge has scales for 3/32" and 3/16" to the foot. Between these scales is a scale divided to 3/32", numbered from left to right by fours from 0 to 124, and numbered from right to left by twos from 0 to 62. This side is marked: 1621P KEUFFEL & ESSER CO. N.Y. PARAGON.

One edge of the second side has scales for 1" and 1/2" to the foot. Between these scales is a scale divided to 1/2", numbered from left to right by ones from 0 to 10 and from right to left by twos from 0 to 20. The other edge has scales fro 1/8" and 1/4" to the foot. Between these scales is a scale divided to 1/8", numbered from left to right by fours from 0 to 92 and from right to left by twos from 0 to 46.

One edge of the third side has scales for 3/4" and 3/8" to the foot. Between these scales is a scale divided to 3/8", numbered from left to right by ones from 0 to 14 and from right to left by twos from 0 to 28. The other edge has scales for 1-1/2" and 3" to the foot. Between these scales is a scale divided to 1-1/2", numbered from left to right by twos from 0 to 4 and from right to left by ones from 0 to 2. This side is marked: RHW.

A triangular green cardboard box has masking tape at both ends. A red and green paper label is marked: K + E PARAGON (/) ARCHITECTS' TRIANGULAR SCALE (/) 1621P 12 IN. (/) MADE IN U.S.A. TM'S REG. U.S. PAT. OFF.

Keuffel & Esser began to offer model 1621P between 1901 and 1909, when it cost $2.50. The firm introduced the logo shown on the box in 1943. In 1944, this instrument sold for $7.50. The company changed its model numbers in 1962. According to the donor, the instrument was used by her husband, the electrical engineer Robert H. Wieler (1923–1993).

References: Catalogue and Price List of Keuffel & Esser Co., 33rd ed. (New York, 1909), 190; Catalogue and Price List of Keuffel & Esser Co., 40th ed. (New York, 1944), 138.

Date Made: 1943–1962

Maker: Keuffel & Esser Co.

Location: Currently not on view

Place Made: United States: New York, New York City

Subject: MathematicsDrafting, Engineering

Subject:

See more items in: Medicine and Science: Mathematics, Science & Mathematics, Scale Rules

Exhibition:

Exhibition Location:

Credit Line: Gift of Norma P. Wieler

Data Source: National Museum of American History

Id Number: 1998.0032.04Catalog Number: 1998.0032.04Accession Number: 1998.0032

Object Name: scale rule, triangulartriangular rule

Physical Description: boxwood (overall material)plastic (overall material)paper (overall material)Measurements: overall: 2.7 cm x 32.4 cm x 3 cm; 1 1/16 in x 12 3/4 in x 1 3/16 in

Guid: http://n2t.net/ark:/65665/ng49ca746a5-158c-704b-e053-15f76fa0b4fa

Record Id: nmah_694127

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