. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ed by Wehnelt is as follows : Through a glass tube passes asmall platinum wire, which projects from the sealed end of the tubeonly enough to expose i or 2 square miUimetres of platinum surface;it is immersed in a mixture of sulphuric acid and water having a specificgravity of Into this liquid there also dips a lead plate. Thecurrent is sent through the solution by means of these electrodes. Theplatinum terminal should be connected to the posi
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ed by Wehnelt is as follows : Through a glass tube passes asmall platinum wire, which projects from the sealed end of the tubeonly enough to expose i or 2 square miUimetres of platinum surface;it is immersed in a mixture of sulphuric acid and water having a specificgravity of Into this liquid there also dips a lead plate. Thecurrent is sent through the solution by means of these electrodes. Theplatinum terminal should be connected to the positive wire of the supplycircuit, and the lead plate to the negative wire. A convenient methodof ascertaining which is the positive pole is to place a strip of moistened X-RAY EQUIPMENT 21 litmus paper upon a dry board or other insulating material, and to touchone end of the strip with a wire from one terminal of the circuit, andthe other end with a wire from the other terminal. The litmus paperwill be colored red about the positive terminal. Caution is necessaryto avoid touching the two sides of the circuit at the same time with the up VOL,T«. Fig. II. Heinze interrupter. C, end of platinum wire; F, earthenware jar;S, sulphuric acid solution. (Rollins.) A platinum rod is moved up and down by a small motor through the opening of a glass tubeimmersed in dilute sulphuric acid, the rod being the positive terminal through which the currententers. The negative terminal is a lead plate. This is the steadiest form of electrolytic break yetintroduced. hands, as this contact might result in disagreeable shocks or burns ;direct connection, technically called short-circuiting, between the twoterminals of the supply should also be avoided. This interrupter gives a very rapid make and break of the circuit,produces a powerful secondary discharge, and may be placed directly in 2 2 THE ROENTGEN RAYS IN MEDICINE AND SURGERY the iio-volt circuit, but cannot be used with a current of much below50
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