On the Centering Eccentricity of the MOM Gi-B3 gyrotheodolite

Abstract

The gyrotheodolite type MOM Gi-B3 has been examined to determine the effects of systematic and random errors due to centering and setup eccentricities. A new bifunctional centering device was manufactured for the said instrument using a centering tip to ensure centering on a pillar and a spigot to attach a reflector onto it and thus enable to determine the gyrotheodolite’s position in an engineering surveying network directly. Precise horizontal angle measurements and forward intersection were used to determine eccentricities of the different centering devices used with the MOM Gi-B3 surveying instrument. In this paper I present the instrument’s construction and its centering devices, geodetic fundamentals, the examinations and their results. Finally I state conclusions and form suggestions for use.