The Royal observatory, Greenwich. A glance at its history and work (1900)
Maunder, E. Walter (Edward Walter), 1851-1928 · London, The Religious tract society · leaf 246
The third pencil indicatesthe amount of rain that has fallen since the lastsetting, the pencil being moved by a float in thereceiver of the rain gauge. An objection to all the mechanical methods ofcontinuous registration is that, however carefully thegearing between the instrument itself and the… … V . S ■ i . *. . *• —n<r ■ i. * %
Royal Greenwich Observatory · Astronomy
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