Scale RulesTriangular Rules
To help users place the scales as close to their drawings as possible, makers sometimes placed open divided and chain scales along the sides of a triangular prism. Significant American manufacturers and retailers represented on this page include Darling, Brown & Sharpe of Providence, R.I.; James W. Queen & Company of Philadelphia; Keuffel & Esser of New York; and the Eugene Dietzgen Company of Chicago.
"Scale Rules - Triangular Rules" showing 1 items.
- On one face this 12" steel triangular rule has scales for 3/16" and 3/8" to the foot. Between these scales is a scale divided to 3/32", numbered from left to right by twos from 0 to 62, and numbered from right to left by fours from 4 to 24. The second face has a scale of inches numbered by ones from 1 to 12. The first two inches are divided to 1/128"; the next two inches are divided to 1/64"; inches 4–6 are divided to 1/32"; inches 6–8 are divided to 1/16"; and inches 8–12 are divided to 1/8".
- The third face also has a scale of inches numbered by ones from 1 to 12. The first two inches are divided to 1/100"; the next two inches are divided to 1/50"; inches 4–6 are divided to 1/20"; inches 6–8 are divided to 1/96"; inches 8–10 are divided to 1/48"; and inches 10–12 are divided to 1/24". This side is marked: W. Metcalf 1882.
- Sisters Elizabeth Henshaw Metcalf (1852–1925) and Sarah Spathding Metcalf (1858–1939) donated this rule to the Smithsonian in 1931, within several containers of materials sent from the family home in Worcester, Mass. The bulk of the materials were ethnographic specimens collected by the women as they visited and lived in the Philippines at various times between 1905 and their deaths. The name on the rule probably refers to their brother, Wallace Metcalf (1854–1904). He graduated from Worcester Polytechnic Institute with a degree in mechanical engineering in 1873, lived with his sisters for many years, and worked in Worcester as a civil engineer.
- References: Cherubim A. Quizon, "Two Yankee Women at the St. Louis Fair: The Metcalf Sisters and their Bagobo Sojourn in Mindanao," Philippine Studies 52, no. 4 (2004): 527–555; "Alumni Notes," The Journal of the Worcester Polytechnic Institute 7, no. 4 (May 1904): 355; accession file.
- Currently not on view
- date made
- Metcalf, W.
- ID Number
- accession number
- catalog number
- Data Source
- National Museum of American History, Kenneth E. Behring Center