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 5905-00-920-1433
NSN 6620-01-456-0529
NSN 6105-01-123-1937
NSN 5835-00-023-0780
NSN 5895-01-607-1425
NSN 6130-01-013-9343
NSN 6650-00-170-5095
NSN 5925-01-384-3234
NSN 5910-00-222-8193
NSN 5910-01-224-9280
NSN 5975-01-543-4221
NSN 6220-00-564-2868