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 116
me as though both had been present at onetime. A familiar toy depending on this principle, andcalled the thaumatrope, consists of a bit of white card II VISIBLE SPECTRUM AND THE EYE 5 held between two strings on which it can be twirled.On one side there is painted say a horse; on the otherhis… … other side, a bird. By a band and pulley we spin thecard rapidly; and lo ! you see the bird within its cage. I hold in the lantern a small disk of sheet metalhaving a number of holes pierced in it; giving on thescreen a lot of bright points of light. Then on makingthis disk vibrate on the end of a…
Light · X-rays
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