W. & L.E. Gurley Surveyor's Transit Model 17 with Solar Attachment, Troy New York, late 19th century, 5-inch silvered dial engraved "W. & L. E. Gurley, Troy, N.Y.," with fleur-de-lis representing North, reversed East and West points, blued-steel needle mounted to central brass hub, raised needle ring divided 0-90° in four quadrants, dual spirit levels located on horizontal plate, interior silvered vernier scale with tangent-screw adjustment, twin "A-frames" supporting 3-inch radius vertical half-circle with silvered arc divided 0-90-0°, 6-inch spirit level, 11-inch telescope and solar attachment with horizontal hour ring divided I - XII, 5-inch radius declination arc all mounted on four-screw leveling base, original fitted box with interior label,s, plum level, and addition spirit level, ht. with solar attachment 17 in.
Note: The original version of the solar compass was invented by William Austen Burt in 1835 to solve the problem of aberrations caused by local attractions of the magnetic needle. His invention quickly became a requisite for all U.S. land surveys. Gurley advertised their solar attachment as being "essentially the solar apparatus of Burt placed upon the cross bar of the ordinary transit."
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