American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 199
s are the sines of the respective angles, whateverbe the length of the line E m or E n. In theparticular case above referred to, where theselines are considered [as units, the fractions —- and —- or, in other words, m o and np become, as stated, the sines of the respectiveangles. We are now… … end M L casting a shadow which reaches tothe point E. Fill the vessel with water—theshadow retreats to H through the refractionof the light at the point where it enters thewater. The angle enclosed between M Eand M L is equal to the angle of incidencex, and in accordance with the definition T F T…
Clocks and watches
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