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 5855-00-145-3307
NSN 6130-01-316-8564
NSN 5895-01-309-8499
NSN 5855-00-135-0797
NSN 6150-01-431-4143
NSN 5895-00-011-7880
NSN 6110-00-422-4973
NSN 6685-01-531-0082
NSN 4140-00-289-9263
NSN 6650-01-141-1582
NSN 6610-01-527-0922
NSN 6220-00-998-3476