Todd, David P. (David Peck), 1855-1939 · New York, Cincinnati [etc.] American book company · leaf 132
The Earth Turns on its Axis ii6 These arrangements should be made beforehand, as in the ilkistra- tion. The problem is to adjust the short line relatively to the long one, so that the vertical plane passing through the two plumb-lines … Finding' True North without Clock or Telescope (from a Photograph b}'' Lovell) shall pass also through the pole star when crossing the meridian. This vertical plane will then itself be the meridian, and must therefore intersect the horizon in the true north and south points. But we have seen that…
Astronomy
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