Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 762
Fig. 701 fig. 701. On the left of fig. 702 is seen a metal frame across which isstretched a horse-hair, forming a sight-vane. Exactly opposite this is aright-angled prism P enclosed in a metal case, with an eyehole and a slitas represented at the side of the figure. When an observation is to be… … ^ ^ s| sM s} 4 i -733] Inclination or Dip. Magnetic Equator 739 so that the slit in the prism, the hair of the sight-vane, and the distant objectare seen to be in the same Une ; the observer, looking through the eyehole,notes the angle which the needle makes ; a similar observation is madewith…
Physics
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