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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.
Surveyor's Transit. National Museum of American History. Addthis Share Tools. Share Icon. Print; Object Details W. & L. E. Gurley Description ...
Gurley began making these gradienters in 1885. 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.
This is marked "W. & L. E. Gurley, Troy, N.Y." Gurley described it 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.
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.
The Gurleys introduced serial numbers in 1908, with the first digits indicating the year of manufacture, and the latter digits indicating production rate. Thus, transit #9296 was the 296th Gurley instrument made in 1909. W. & L. E. Gurley was incorporated in 1900, with all the stock held by the family.
The Capitol Land Board appointed J.T. Munson to survey the Texas Panhandle land that would eventually become the legendary XIT Ranch. Surveyors of the time likely used a tool like this. Crafted by W. and L.E. Gurley, this transit was an advanced version of the compass, but with a telescope attached.
