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 2925-00-159-9003
NSN 5996-01-349-0261
NSN 6130-01-442-8759
NSN 6130-01-271-3505
NSN 5855-01-397-1105
NSN 6620-01-254-7963
NSN 5905-01-456-9294
NSN 5996-01-421-4761
NSN 7035-01-641-4054
NSN 6645-01-069-8746
NSN 5895-01-063-7400
NSN 6145-01-579-1855