. American quarterly of roentgenology . k now I am more likely to use this for developerof a formula especially adapted for photographic plates exposedwith the intensifying screen. On the left hand are two tanksof same length and width as those on the right. The backone, nine inches wide, holds the acid hypo. The front one, 12inches wide has the running water. 224 AmIRican Quarterly of Roentgenology. The water enters behind, and is distril)uted under, a metalstrip across the top at the left hand end. By means of a metal plate at the right hand end, the wateris made to leave from the bottom, th
. American quarterly of roentgenology . k now I am more likely to use this for developerof a formula especially adapted for photographic plates exposedwith the intensifying screen. On the left hand are two tanksof same length and width as those on the right. The backone, nine inches wide, holds the acid hypo. The front one, 12inches wide has the running water. 224 AmIRican Quarterly of Roentgenology. The water enters behind, and is distril)uted under, a metalstrip across the top at the left hand end. By means of a metal plate at the right hand end, the wateris made to leave from the bottom, thus a perfect circulationis secured from top to bottom. The bottom of each of the five tanks being one and a halfinches higher than that of the spill-way allows an opening(L-shaped in longitudinal section) by which each tank maybe emptied and cleaned. These openings are closed by rubberplugs and no metal appears in contact with any of the part is readily accessible for thorough cleaning. CQMBIUATIOf^mV[LOTINQ\ FIXINQTANK. I have had some trouble with the fluctuation of the level ofthe developer when, for instance, one days work happens torun all small plates and the next day mostly large ones. Toovercome this, I am having a hole drilled in that tank at thenormal level. To this will connect by about 18 or 20 inchesof rubber tube the lower opening of a two quart douche the developing begins the bottle, with its top vent open,rests below the level of the developer. When the level becomestoo low the top vent of the bottle is closed and the bottleraised. The air pressure keeps the solution from flowing outwhen the opening is covered. By this device the normal level can be maintained with aminimum of attention. BowEN: Laboratory Notes 225 Advantages.—First, economy. The most valuable item abouta Roentgen laboratory is time. The tank will accommodate 15plates of all sizes. Thus the operation is at least 15 times asfast as by single tray. Only a few of us a
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