. American X-ray journal . » % \ I. First Electric Machine, L671 A. I),ttired the first static machine in discovered the principles of attrac-tion and repulsion, also conduction anda spark, his machine being a sulphurball revolving in trunions. In invent-ing this machine Guericke discovered all of the currents which have been calledby many names since. The next inventor was Newton, whosubstituted a glass ball in place of thesulphur one. Later Hawksby discov-ered the electric glow or electric lightand he brought it prominently beforethe public. Subsequently there were aseries of
. American X-ray journal . » % \ I. First Electric Machine, L671 A. I),ttired the first static machine in discovered the principles of attrac-tion and repulsion, also conduction anda spark, his machine being a sulphurball revolving in trunions. In invent-ing this machine Guericke discovered all of the currents which have been calledby many names since. The next inventor was Newton, whosubstituted a glass ball in place of thesulphur one. Later Hawksby discov-ered the electric glow or electric lightand he brought it prominently beforethe public. Subsequently there were aseries of balls used together, and in1731 Gray made extensive experimentsin producing electricity by rubbing aglass rod, and charging bodies sus-pended by silk ropes. From that time on various styleswere introduced one of which had aglass cylinder, another a glass plate. First Electro-Therapeut in tne U. S. 1740. and these were used until Holtz madehis celebrated induction or influencemachine in 1856. This remains todaythe most powerful machine for gener-ating static electricity. The old writers call attention particu-larly to their methods of treatment;they will be found to mention a sparktreatment, Leyden jar shock, and abrush discharge from points, eithermetal or wood. Attention is especiallycalled 10 the method of treating withLeyden jars or a Leyden jar modifica-tion mentioned by these old writers,which is called the Lane Electrometer,but which has been claimed by one of THE AMERICAN X-RAY JOURNAL. 969 our recent writers as his induced currentand as having been discovered by himin 1881. These methods were fully de-scribed by Cavello, Franklin, Watson,Priestly, Cuthburtson, and by Adamsover a hundred years ago. When the history of the subject islooked into are not the statements of avery prolific writer of the present time,who claims to be the dis
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