A telescopic instrument used in determination of wind direction and speed by optical tracking of free moving balloons. Two telescopes are generally provided, one for finding the object and the other for tracking. Sighting through the scopes is by means of right angle eyepieces. Vernier scales are used for fine reading of the horizontal and vertical circles. Some instruments are designed with auxiliary devices for plotting the observed positions at the time of observations. Illumination may be provided for observations at night. Excludes transit and transit, pocket.
Classification: Parts and accessories for surveying
NSN 5996-01-529-4964
NSN 5985-01-462-0828
NSN 5935-01-164-2495
NSN 5985-01-108-1873
NSN 6620-01-446-2258
NSN 5975-00-166-5800
NSN 7035-01-088-6415
NSN 6220-01-473-6399
NSN 5960-00-661-0477
NSN 5915-00-206-0086
NSN 5996-01-556-2135
NSN 2925-01-164-9579