. X-rays simply explained : a handbook on Röntgen rays in theory and practice . sksfor a low tube and a small coil. A live cat or dog in a basket is a good subject fortiuoroscopy, and the movements of a cats jaw whenit mews and of the vertebrcc in the tail are fascinat-ing to watch. A curious and interesting subject for a radiographis a human hand in which the lines and depressionsare made visible. For this purpose putty is kneaded well into theskin, and the surface is then worked up carefullywith glycerine until it is quite smooth, after whicha little subnitrate of glycerine is rubbed over ge
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . sksfor a low tube and a small coil. A live cat or dog in a basket is a good subject fortiuoroscopy, and the movements of a cats jaw whenit mews and of the vertebrcc in the tail are fascinat-ing to watch. A curious and interesting subject for a radiographis a human hand in which the lines and depressionsare made visible. For this purpose putty is kneaded well into theskin, and the surface is then worked up carefullywith glycerine until it is quite smooth, after whicha little subnitrate of glycerine is rubbed over gentlyand smoothly. Radiograjohy.—The adjustment of the currentand speed of interruption which best suits radioscopydoes not always give the best results in radiography,the tendency on the whole being to rapid and com-paratively weak impulses for the former and slow-frequency strong impulses for the latter. If no screen is available, the working of the tubemust be judged by the degree of tluorescence in theglass. ftft \-ll,\\.s Plate II. O W W I i>- \ I-. Gkoup of OniECTS :—Fountain }»cn in case; spec-tacles in case ; pencil, showing graphite ; bradawl, showing grainof wood ; instruments in wooden case ; leather jiurse containingcoin, and sho\\ing internal and external clasps and ornamentalmetal corners of flap. Conditions as for Plates III. and IV., exposure, which was 10 seconds. PRACTICAL X-RAY WORK 89 When a Wiuishurst is employed the only p(jsHiljleadjustments are length of spark, speed of plates,jind angle of neutralising bruslies. In taking the first radiograph a useful additionalappliance is a sheet of i\y-in. lead a))out H in. x 9 wrapped-up plate, hitherto safely stowed awayin the metal l)ox, preferably at some distance, is now-laid on the table with the film side uppermost. The tube must not be set W(jrking when the plateis out of the protective box, until all is ready for theexposure. Tiie hand to be radiographed
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