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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.
The transit is easily detached from the leveling head, and the two are stored separately in the box. 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 | Smithsonian Institution. National Museum of American History. Details. Related. Object Details. 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."
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.
W. & L. E. Gurley made their first lightweight instrument—an aluminum transit—in 1876. But the prohibitive cost of aluminum kept them from manufacturing instruments of this material. Following World War I, Gurley introduced a line of instruments made of an aluminum alloy named Lynite. This transit is of that sort.
The first dedicated busway opened along I-10 in 1973, and the region's first light rail line, the Blue Line (now the A Line) opened in 1990. Today the system includes over 160 miles (260 km) of heavy rail, light rail, and bus rapid transit lines, with multiple new lines under construction as of 2019.
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."
