Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 212
ment is employed.This type of instrument is essentially a transit circle whichcan be rotated about avertical axis into anydesired azimuth. It istherefore in principlesimilar to, though muchlarger than, a theodo-lite. The azimuth ofthe instrument is deter-mined from stellar ob-servations, the… … 100. The Chrono-graph. — In modernmethods of observa-tion with the meridiancircle or altazimuth,the times of transit ofan object across thevertical wires are re-corded automatically:for this purpose aninstrument called achronograph is em-ployed. The mostcommon type of chro-nograph, such as that…
Astronomy
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