Gurley Transit

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This is marked "W. & L. E. Gurley, Troy, N.Y. 9296." Gurley described it as a Surveyor's Transit with two verniers to the horizontal limb. The horizontal circle is silvered, graduated every 30 minutes of arc, and read by opposite verniers to single minutes. There is a clamp and a tangent to the telescope axis. With tripod, this transit sold for $148. The serial number indicates that it was the 296th instrument that Gurley made in 1909.
Ref: W. & L. E. Gurley, Manual of the Principal Instruments used in American Engineering and Surveying (Troy, N.Y., 1909), pp. 43-46 and 272.
Currently not on view
date made
W. & L. E. Gurley
place made
United States: New York, Troy
overall: 13 1/4 in; 33.655 cm
horizontal circle: 8 in; 20.32 cm
needle: 5 in; 12.7 cm
telescope: 11 in; 27.94 cm
hanging level: 6 1/4 in; 15.875 cm
overall: 13 1/4 in x 7 7/8 in x 11 1/2 in; 33.655 cm x 20.0025 cm x 29.21 cm
ID Number
catalog number
accession number
Credit Line
Ronald Mason Grimes
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History