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 45
sely as we saw for the ripplesin the ripple-tank. We have now got as far as the making of real images 28 LIGHT LECT. by so changing the shapes of the wave-fronts and theirconsequent lines of march as to cause them to converge tofocal points. Let us try a few more experiments on theformation of… … Fig. 16. which are made white-hot by the flow of the electriccurrent between them. I cover up the opening in frontof the lantern by a piece of tin-foil, and in this I nowstab a small round hole with a pointed stiletto. Atonce you see thrown on the screen an image (Fig. 17)of the two white-hot tips…
Light · X-rays
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