Meadowcroft, Wm. H. (William Henry), 1853- · New York : The American Technical Book Co · leaf 15
^ are transverse vibrationsin the ether, like those which constitute lightand radiant heat but of very much higher pitchor excessively short length of waves. One instance will suffice to make the abovedifferences clear to the reader. It is well knownthat rays of light may be deflected, refracted… … Fig. i. an ordinary magnifying glass which is simplya glass lens of convex shape as shown in Fig. i.The rays of light proceeding from A strike thelens and are condensed and brought to a focus,or point of meeting, on the other side of the lens.This is one of the principles applied in the ordi-nary…
X-rays
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