April 24, 2024
antique W & LE GURLEY engineer's surveyor's transit with gradienter
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antique W & LE GURLEY engineer's surveyor's transit with gradienter . It is pre-1908, when serial numbers began to appear on the compass dial. Compass needle is 5" long, telescope is 11". The gradienter is a micrometer wheel with silvered rim divided into 100 parts. One turn of the wheel tilts the telescope to a 1% grade. There was originally a thin arm or blade attached to the frame with divisions on it, to record the number of turns of the wheel, but this is missing. The gradienter screw also serves as an ordinary tangent screw to incline the telescope. The black paint indicates government ownership, I have read somewhere. The tripod plate has been changed from the original Gurley thread to the more common thread of 3.5 inch by 8 threads per inch, as used by K&E and others. This transit is old and has been used. The vertical arc scale is worn at the edge where it contacts the vernier scale. The levels all work, and the adjustment screws all turn. The optics are good and the stadia hairs are present. The box is not a Gurley box; has a label on it marked Buff. The leather strap is new. Weight is 35 lbs.
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