Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 129
l work very well,and will not require such high exhaustion as larger ones.Small cathodes should, in proportion, have a less focal lengththan large ones for the best results. Probably a good averagesize for ordinary work is about 1125 in. diameter, with 075 in.radius of curvature. It is important… … Fig. 35.—Hittorfs Experiment. markable. Within certain limits, the current passes moreeasily when the two are wide apart than when close together.This was pointed out in 1884 by Hittorf, who demonstrated itby means of the tube shown in Fig. 35. When this is highlyexhausted, and a discharge passed…
X-rays
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