. X-rays simply explained : a handbook on the theory and practice of radiography . harge distance possible. T> is attached to 9 1(1 X-RAYS SIMPLY EXILAl the i he bulb, \\ hich is arrun I hal il i an s?ed on to an air pump and exhausted bo anydesired d< A; atmo- spheric pre Bure the ordinarywell-known discharge phe-nomena occur \\ hen the twoballs are connect* d with themdary of an Inductioncoil, [f the balls be placedtoo far apai t for any acl ualspark to pa $s, thin purpletree-like Btreaks proceedfrom the elect rodes and ap-pear to bush <»ui from themin all directions, while fromthe
. X-rays simply explained : a handbook on the theory and practice of radiography . harge distance possible. T> is attached to 9 1(1 X-RAYS SIMPLY EXILAl the i he bulb, \\ hich is arrun I hal il i an s?ed on to an air pump and exhausted bo anydesired d< A; atmo- spheric pre Bure the ordinarywell-known discharge phe-nomena occur \\ hen the twoballs are connect* d with themdary of an Inductioncoil, [f the balls be placedtoo far apai t for any acl ualspark to pa $s, thin purpletree-like Btreaks proceedfrom the elect rodes and ap-pear to bush <»ui from themin all directions, while fromthe tips of the smallestt w igs, if one may call themso, perfectly straight, radial,fine blue lines seem to si ickout like tin hairs of a brush,and it is from this appear-ance that the effi ct receivesits name oi brush occurs to a far greaterextent if the dischargetakes place between the distance bet weenthe balls is reduced until itis equal to the maximumlength of spark the coil is able to produce, thedischarge becomes a long purple thread with abortive. KlG. 1. HISTORICAL AND 11 tree-like branches leaving it at different points alongits track. These subdivide into liner and finer si reaksuntil they are lost to sight and reach their destina-tion as silent, discharges. At a still slimier distance the spark is wavy andfree from ramifications. Its colour is brighl blue,and it is accompanied by a lend snap. As the balls are approached even closer the sparkbecomes reddish in colour and apparently noise is much reduced, and it has considerableheating effects; The maximum heating effect is pro-duced when the halls are quite close together, thesparks appearing as a very thin blue streak sur-rounded by a thick yellow sheath of hut gas. These phenemona at atmospheric pressure are beslobserved without the bulb, fig. 1, a pair of ordinaryadjustable discharge rods being most suitable. Inter-changeable balls, discs, and points on their ends,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcathode, bookyear1903
