Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 55
of which has been ground to a semi-cylinder(Fig. 22). The refractedbeam emerges at a differ-ent angle, its line of marchhaving been made moresteeply oblique by theretardation of the glass.If you measure the anglesnot in degrees but by thestraight distances acrossthe circle, you will findthat, for… … Fig.
Light · X-rays
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