Kaye, G. W. C. (George William Clarkson), 1880-1941 · London, New York [etc.] Longman's Green, and Co. · leaf 262
of the scale arethe waves which were originally discovered by Hertz andare now used in wireless telegraphy. The longest wave-length generated up to the present is about 15,000 metres,or a little over nine miles : the shortest is a few milli-metres. The waves ordinarily used in wireless are afew… … Fig. 113.—Reflection of y raya. Next to Hertzian waves, in order of magnitude, comethe infra-red or heat rays, the greatest wave-length yetobserved being ^ mm. We pass from these right throughthe visible spectrum to the ultra-violet rays, which havebeen explored by Schumann and Lyman as far as…
X-rays
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The space-threshold of colours and its dependence upon contrast [microform] : first article (1898)](https://img.insideoutlibrary.com/img/200/ia-alberta_01297-116-1.webp)
