triangular engineer's scale
Datecirca 1936
Inventory Number1997-1-1921
ClassificationRuler
Subject
Maker
Keuffel & Esser Company
1867 - 1987
User
William R. Osgood
Cultural Region
Place of Origin
Dimensionsscale: 2 × 2.3 × 32.1 cm (13/16 × 7/8 × 12 5/8 in.)
case: 2.5 × 2.5 × 32.3 cm (1 × 1 × 12 11/16 in.)
case: 2.5 × 2.5 × 32.3 cm (1 × 1 × 12 11/16 in.)
Material
Accessoriestriangular cardboard sleeve case
DescriptionThe triangle ruler is stored in a green, triangular, cardboard sleeve case. The rule is white with a beige, hardwood center bar. Each of the three sides has two sets of plane measurements in black lettering, one on either side of the center bar.
Signedin black lettering along center bar: KEUFFEL & ESSER Co.
in white lettering on red background on label on green storage case: K & E CO.
Inscribedin black lettering along center bar: 1631P / N.Y. PARAGON
in black lettering on white background on label on gree case: PARAGON TRIANGULAR SCALE / REG. U.S. PAT. OFF. / 1 ONLY 1631P 12 IN. / MADE IN U.S.A. REG. U.S. PAT. OFF.
FunctionTriangle rulers are used for measuring and drawing straight lines in various plane scales. They are particularly useful for engineers, architects, and draftsmen for providing numerous measures at once. Blueprints, and other design schematics are not drawn to scale and these rulers make it easy to determine the actual length of represented lines with minimal calculations.
ProvenanceRuler was owned by William R. Osgood (Engineer, Harvard class of 1917). The ruler was donated by his nephew Theodore K. Osgood on November 20, 1997.
Keuffel & Esser Company
Date: circa 1936
Accessories: triangular cardboard sleeve case
Object number: 1997-1-1922
Keuffel & Esser Company
Date: circa 1936
Accessories: triangular cardboard sleeve case
Object number: 1997-1-1923
Eugene Dietzgen Company
Date: circa 1925
Accessories: triangular cardboard sleeve case
Object number: 1997-1-1920
American
Date: circa 1935
Accessories: triangular cardboard sleeve case
Object number: 1997-1-1924
Darling, Brown, and Sharpe
Date: circa 1890
Accessories: fitted, triangular leather holder
Object number: DW0467
Keuffel & Esser Company
Date: circa 1935
Accessories: leather sleeve case
Object number: 1997-1-1928
Charles W. Dixey
Date: circa 1830
Accessories: silver framed green shagreen case
original curatorial cards and photos
Object number: DW0288
Keuffel & Esser Company
Date: circa 1954
Accessories: mahogany case
Object number: 1997-1-1997
Frederick Post Company
Date: early 20th Century
Object number: 2004-1-0340
Keuffel & Esser Company
Date: early 20th Century
Object number: 2003-1-0215
Troughton & Simms
Date: circa 1850
Accessories: green shagreen-covered wood case with silver frame
Object number: DW0232