Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 433
elf which is rendered visible; but whenever a beam of sun-light, or of any other brilliant light, is allowed to pass through an apartmentwhich is otherwise kept dark, the track of the beam is always distinctlyvisible, and, especially if the light be concentrated by a lens or concavemirror, the fact… … Fig. 190. Professor Tyndall, in the course of some remarkable researches on thedecomposition of vapours by light, wished to have such a glass tube as thatrepresented in Fig. 190, filled with air perfectly free from these floating par-ticles. When the beam of the electric lamp passed through the…
Inventions
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