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Object Details. W. & L. E. Gurley. Description. Gurley described this as a Surveyor's Transit with two verniers to the horizontal limb. The horizontal and vertical circles are silvered, graduated every 30 minutes of arc, and read by verniers to single minutes. There is a clamp and tangent to the telescope axis.
- National Museum of American History
Surveyor's Transit. Usage Conditions Apply. Description:...
- National Museum of American History
W. & L. E. Gurley. Description. This is a Standard Precise Transit, Reconnaissance Model (#112-T), with a telescopic solar unit attached to one standard "as constructed for the Bureau of Land Management." It can be used for standard surveys, as well as for determining the solar meridian quickly and efficiently.
Since the "W. & L. E. Gurley, Troy, N.Y." inscription was engraved by hand, this transit was made between 1852, when Gurley began in business, and 1876, when Gurley's new engraving machine was up and running.
Surveyor's Transit. Usage Conditions Apply. Description: Surveyors who carry instruments long distances, often over difficult terrain, are always concerned about weight. W. & L. E. Gurley made their first lightweight instrument—an aluminum transit—in 1876.
Gurley introduced the Light Mountain Transit in 1876. This example was made after 1886, when Gurley began using bent standards, and before 1908, when Gurley began using serial numbers. The label in the box, with an image of "W. & L. E. Gurley's Instrument Manufactory," was used until 1900, and suggests that the transit was made before that date.
Object Details. W. & L. E. Gurley. Description. Gurley described this instrument as a Light Mountain Transit with two verniers to the horizontal circle. The inscription on this example reads "W. & L. E. GURLEY, TROY, N.Y."
Photos of railroad survey equipment used to build the Transcontinental Railroad. Museums and venues to visit to view and learn about the early railroad surveys.
