. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . d chrome fixing hath I largely employ, as it does not discolorand keeps longer than the plain hypo fixing solution. It is made asfollows : Water 100 oz. (3000 c. c.) Sulphuric acid 3 oz. (90 c. c.) Sulphite of soda 4 oz. (120 grams.) When dissolved, add— Hyposulphite of soda 2 lbs. Dissolve, and add—• Chrome-alum, from one to two ounces, previously dissolved in 20ounces of water. Follow by adding water to make a total of 160 ounces. 218 ELECTRO-THEE APE UTICS. In hospitals aud large laboratories it is useful t
. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . d chrome fixing hath I largely employ, as it does not discolorand keeps longer than the plain hypo fixing solution. It is made asfollows : Water 100 oz. (3000 c. c.) Sulphuric acid 3 oz. (90 c. c.) Sulphite of soda 4 oz. (120 grams.) When dissolved, add— Hyposulphite of soda 2 lbs. Dissolve, and add—• Chrome-alum, from one to two ounces, previously dissolved in 20ounces of water. Follow by adding water to make a total of 160 ounces. 218 ELECTRO-THEE APE UTICS. In hospitals aud large laboratories it is useful to employ two largewooden boxes that act as tanks. (Fig. 108.) In the PhiladelphiaHospital I have these boxes divided into different sized compartmentsto accommodate the various sized plates. Each compartment has sixvertical grooves, for holding six plates. One of these tanks containsthe acid hypo sufficient for six months use. The other tank is similarlyconstructed, in which the water enters at the bottom and circulatesto the top, and then overflows into a discharging Pig. 108.—Authors washijig tank. The fixing tank is similar in construction. Washing.—After fixing, washing must be quickly and thoroughlydone. One hours washing with running water is sufficient; if the sup-ply be not so accessible, place the negative in a flat dish and constantlyrock for five or ten minutes. Change the water and repeat the processfor one-half to three-quarters of an hour. Remove the negative, againwash under the spigot, using a pledget of cotton to wipe off any foreignparticle adhering to the gelatine coating. Drying.—Dry the negative in a room of moderate temperature, inwhich a ventilator supplies plenty of air. Do not dry in the sun, as THE PEINCIPLES OF TECH]!^IC. 219 sunlighit produces softening and increases the density of tlie film. Todry a negative hurriedly,—i. e., in five or ten minutes,—lay it in a bath ofalcohol after \rashing thoroughly, or put before an electr
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