Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 749
Fig. 482. 633. Conical Refraction. — It was pointed out by Sir Wil-liam Hamilton that if the refracted plane wave should havesuch a position, MN (Fig. 482), that it was tangent to bothsheets of the wave surface, this plane would touch the sur-face in a circle, and any line drawn from 0 to this… … The truth of this prediction was tested by Lloyd in the fol-lowing experiment. A piece of aragonite, CD (Fig. 483), was cut with its facesperpendicular to the bisector of the optic axes, and a sheet of metal foil pierced witha small hole, (9, attached tothe upper face. A pencilof light was…
Physics
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