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 6620-01-294-1044
NSN 5920-00-001-3263
NSN 6130-01-196-2046
NSN 6620-00-727-8043
NSN 5835-00-930-8500
NSN 5985-01-009-6437
NSN 5915-00-528-9286
NSN 6685-01-651-7109
NSN 5835-00-583-1316
NSN 6645-00-391-6264
NSN 6320-00-238-9973
NSN 6105-00-088-5080