INVESTIGATION OF THE GYROTHEODOLITE GI-B1,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The article discusses the general principles of the three-degree-of-freedom gyroscope and considers especially one with a gyroscopic pendulum. The method is outlined by which such a device may be used to measure displacements on the earths surface. The Gi-B1 gyrotheodolite was designed on this basis. It was designed for independent determination of astronomic azimuth with a mean square error of plus or minus 20 min during a period of 30-45 minutes at latitudes up to 70 deg during any part of the day or year at air temperatures ranging from -30 to 50C, regardless of local conditions or magnetic anomalies and can be used underground. It is a composite instrument including, with the gyrotheodolite as the main element, a power unit, a tripod, a connecting cable, and a storage battery. The theodolite weighs 21 kg, the power unit 11 kg. The horizontal circle nondetachable is patterned after the Ti-B1 second theodolite, which differs from the first by having a built-in autocollimation system and an auxiliary reading microscope for the optical micrometer, and by a larger horizontal circle. The parameters of all parts of the horizontal circle are given. The mean square error in horizontal direction measurement from a single reading is plus or minus 0.8 min. The power for the gyroscope is three-phase alternating current--30 plus or minus 10 V and 416.6 plus or minus 5 cycles.
- Optical Detection and Detectors