A manual of practical medical electricity : the Röntgen rays and Finsen light . s ; if, how-ever, it be held for an instant near the working focus tube(on the side of the tube which is phosphorescing), it willimmediately lose its electrification, and will be incapableof raising the pieces of paper. The same experiment canbe tried with a piece of sealing-wax rubbed with better method of demonstrating this effect is to makeuse of an electroscope. Charge an electroscope and place it about a yard awayfrom the tube; the latter should be turned so that itsphosphorescing side faces the elec
A manual of practical medical electricity : the Röntgen rays and Finsen light . s ; if, how-ever, it be held for an instant near the working focus tube(on the side of the tube which is phosphorescing), it willimmediately lose its electrification, and will be incapableof raising the pieces of paper. The same experiment canbe tried with a piece of sealing-wax rubbed with better method of demonstrating this effect is to makeuse of an electroscope. Charge an electroscope and place it about a yard awayfrom the tube; the latter should be turned so that itsphosphorescing side faces the electroscope. Then startthe induction coil and observe how rapidly the leaves ofthe electroscope collapse. Stop the coil, and repeat theexperiment with the electroscope at varying distancesfrom the tube ; measure the time that it takes for theleaves to collapse, and it will be found that the nearerthe electroscope is to the tube the more quickly willits leaves collapse, and vice versa. The intensity of theX radiation roughly varies inversely with the square of RoNTGEN X Rays 337. Fig. 150.—Hand showing Needle.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
