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 5985-01-264-9240
NSN 6240-00-044-6914
NSN 6110-01-191-6853
NSN 5910-01-441-3060
NSN 5910-01-630-6235
NSN 5999-00-228-2317
NSN 6685-01-425-6477
NSN 6320-01-607-1491
NSN 2925-01-244-3016
NSN 7035-01-073-5233
NSN 7035-01-361-8821
NSN 5935-01-194-9933