Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 216
the case of heavy instruments : thenecessity of counterpoising the telescope necessitates the standof the instrument carrying a weight much greater than that ofthe telescope itself. Some large instruments are thereforemade with the polar axis in the form of a rectangular frame-work of girders,… … 184 GENERAL ASTRONOMY 100-inch Hooker telescope of the Mount Wilson Observatory. It is necessary that the telescope should be adjusted so thatthe polar axis points accurately to the pole of the heavens andso that the polar and dechnation axes and also the telescopeand declination axes are exactly…
Astronomy
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