0211 0211 MINING VERNIER THEODOLITE Theodolites Surveying Instrument Collection Maker Breithaupt, Kassel, Germany Model N/A Serial Number 99214 Dimensions Telescope Length 165mm, Height 280mm Image Description This is a Mining "Suspension" Theodolite consisting of a vernier reading system for the horizontal and vertical circles. The theodolite is typically used in mining surveying. The interesting design allows the instrument to be hung upside-down in mines and tunnels. The two major components of this mining theodolite include the base section (the socket component), and the upper section (the ball component). This ball and socket joint allows free and frictionless movement of the theodolite relative to the base, permitting the user to level the instrument approximately with minimum difficulty. The horizontal and vertical circles are completely enclosed, and magnifying glasses are attached at opposite ends of each circle for more comfortable vernier reading. History & comments The vernier is an auxiliary graduation, placed alongside the main one with the purpose of determining fractions of the graduation unit. The vernier is typically used with theodolites of medium or low accuracy, as well as for simple angle measuring devices. In 1992, Breithaupt was still selling the subsequent model (No. 2 TEMIN) of their mining (now scale-reading) suspension theodolite. Conservation In a wooden storage box Condition Good Remarks Catalogued by T. Ko Updated by F. Pall Dates Catalogued in 1997. [ Back to Contents ]
