Surveyor's Transit

Surveyor's Transit

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This surveyor's transit marked "Wm. J. Young Maker" and "3192" and "Philadelphia" was made in the early 1850s, soon after William J. Young began putting serial numbers on his instruments. The horizontal circle is larger than the compass box, silvered, and graduated every 30 minutes of arc. The two opposite verniers are on a beveled edge; one reads to single minutes, and the other reads to 1/100 of a degree. The tangent screw that moves the plates is at the south side of the horizontal plate. Level vials are at north and west.
Currently not on view
Object Name
Young, William J.
place made
United States: Pennsylvania, Philadelphia
overall: 11 1/4 in; 28.575 cm
baseplate: 7 in; 17.78 cm
needle: 5 in; 12.7 cm
telescope: 10 1/2 in; 26.67 cm
overall in case: 10 5/8 in x 12 7/8 in x 9 3/4 in; 26.9875 cm x 32.7025 cm x 24.765 cm
ID Number
catalog number
accession number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
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