Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 86
strument ofthis kind is the transit-circle (Diagram XL). Itapplies the advantages the telescope gives in visibility,magnification and accuracy of sighting to the methodused by Tycho Brahe of observing the time when astar crosses the meridian and its altitude at thatmoment. The telescope is fixed… … | 76 ASTRONOMY in the meridian (or vertical plane pointing north andsouth), but is always confined to this plane. In thefocal plane of the objective are two fairly closehorizontal parallel wires and several equally distantperpendicular ones (so-called wires, but in realityspiders webs) (Diagram…
Astronomy
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