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 184
up to the highest ultra-violet has beenadded as an Appendix to this Lecture. iv THE INVISIBLE SPECTRUM 163 a millimetre. The greatest chemical1 effect occurswith waves of about i6£ millionths of an inch, or about0*00041 of a millimetre. Now, it is desirable for purposes of experiment toseparate the… … Fig. 100. use prisms which will disperse the waves and sort themout into a spectrum according to their sizes. Secondly,we may accomplish the same thing by using a diffractiongrating to produce a spectrum. Or, thirdly, we mayemploy, as a means of sifting, sheets of different sub-stances that have…
Light · X-rays
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