Japanese L-Square with Calipers

Object Details

Description

This 8" brass T-square is shaped like an L and has a second short leg attached to a slide on the long leg. On one side, the outer edge of the square is divided into units of 1-3/16" (3 cm), roughly equivalent to the sun, a traditional Japanese unit of length. Each unit is subdivided into 20 parts. The units on the long leg are marked with an O, with three circles marking the fifth unit. The inner edge of the long leg has a 15-centimeter scale, divided to millimeters. The back of the square has a diagonal scale. Compare to MA.261296.

In 1876 the Japanese Empire Department of Education exhibited many instruments at the Centennial International Exhibition, a World’s Fair held in Philadelphia. After the exhibition, John Eaton, the U.S. Commissioner of Education, arranged for the transfer of Japan's entire exhibit to the Bureau of Education (then part of the Department of the Interior) for a planned museum. The museum closed in 1906, and much of the collection, including this object, was transferred to the Smithsonian in 1910.

References: Japan. Department of Education, An Outline History of Japanese Education: Prepared for the Philadelphia International Exhibition, 1876 (New York: D. Appleton, 1876), 121–122, 191–202; U.S. Centennial Commission, International Exhibition, 1876. Reports and Awards, ed. Francis A. Walker (Washington, D.C.: Government Printing Office, 1880), viii:143, 335; U.S. Bureau of Education, Annual Report of the Commissioner (1876), ccxi–ccxii.

Location

Currently not on view

Credit Line

Transfer from Bureau of Education, Department of the Interior

before 1876

ID Number

MA.261304

accession number

51116

catalog number

261304

Object Name

set square

L-square

Physical Description

brass (overall material)

Measurements

overall: 21 cm x 11.5 cm x .6 cm; 8 9/32 in x 4 17/32 in x 1/4 in

place made

Japan

See more items in

Medicine and Science: Mathematics

Squares and Triangles

Science & Mathematics

National Museum of American History

Subject

Mathematics

Education

Drafting, Engineering

Drawing Instruments

Record ID

nmah_904471

Metadata Usage (text)

CC0

GUID (Link to Original Record)

https://n2t.net/ark:/65665/ng49ca746a7-58c4-704b-e053-15f76fa0b4fa