Carnegie Institution of Washington publication . rns-Xi •.: maiiadk : art m «? -??has bw 4o THE DIFFUSION OF GASES THROUGH To keep the water level at the proper height or to raise or lower it by adefinite amount, the screw pump in fig. 13 is available. This consistsessentially of a thick screw 5 playing into the brass tube cc, which is closedat the top by the stuffing box a compressing the ring of soft material bb.The bottom of the tube cc ends in the tubulure i, to be joined by appro-priate tubing with the corresponding tubulure i in fig. 11 a. The brasstube cc, fig. 13, is quite filled with
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Carnegie Institution of Washington publication . rns-Xi •.: maiiadk : art m «? -??has bw 4o THE DIFFUSION OF GASES THROUGH To keep the water level at the proper height or to raise or lower it by adefinite amount, the screw pump in fig. 13 is available. This consistsessentially of a thick screw 5 playing into the brass tube cc, which is closedat the top by the stuffing box a compressing the ring of soft material bb.The bottom of the tube cc ends in the tubulure i, to be joined by appro-priate tubing with the corresponding tubulure i in fig. 11 a. The brasstube cc, fig. 13, is quite filled with water to the exclusion of air, so that everyturn of the screw S raises the level ww in fig. 11 a by a definite amount.The screw5 is also provided with a graduated head (not shown), so that thewhole turns and fractions of a turn may be read off, and the ratio of thediameter of the water level in fig. 11 a and that of the screw S in fig. 13must be known. In the figure the ratio of the areas is about ten to one.