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 5950-01-232-6537
NSN 5950-01-329-1001
NSN 6110-00-977-8534
NSN 6105-01-197-7687
NSN 6610-01-307-6363
NSN 6105-01-281-4279
NSN 6220-00-956-0565
NSN 5910-01-350-1202
NSN 5990-01-514-8030
NSN 6650-01-044-6179
NSN 6650-01-480-0053
NSN 5960-01-512-0233