. Acidity and acidimetry of soils. Soils. uniform results it was necessary to have a gas cell which could be agitated continuously, as apparently the agitation produced by the entering gas was not sufficient. After a number of trials the gas cell shown in Fig. I was designed for this work. It is cylindrical in shape, cm. in diameter and 16 cm. in length,. Fig. I the ends being rounded off. At one end an opening is provided of a size to carry a No. 4 rubber stopper, through which pass the electrical connection a to the platinum plate b to serve as the hydrogen electrode, the tube c for the
. Acidity and acidimetry of soils. Soils. uniform results it was necessary to have a gas cell which could be agitated continuously, as apparently the agitation produced by the entering gas was not sufficient. After a number of trials the gas cell shown in Fig. I was designed for this work. It is cylindrical in shape, cm. in diameter and 16 cm. in length,. Fig. I the ends being rounded off. At one end an opening is provided of a size to carry a No. 4 rubber stopper, through which pass the electrical connection a to the platinum plate b to serve as the hydrogen electrode, the tube c for the ingress of hydrogen gas, and tube d for the outlet. Tubes c and d have capillary tubes sealed into the ends to regulate the flow of hydrogen. To make connections with the calomel half cell a glass tube, g, is provided at the further end of the gas cell provided with a stopcock, /, and a constricted tip, h. This tube reaches to within a few mm. of the bottom of the gas cell and as it did not readily clog with soil was found to be very satisfactory. The gas cell was designed to be of 100 cc. capacity and to be filled half full of liquid, leaving room for 50 cc. of gas. The reason for this arrangement will develop later. The hydrogen electrode 6 is a rectangular piece of sheet platinum, x cm., with pieces of platinum wire welded to each end, and is similar to that used by Gillespie.' The wires were welded into the glass tube at each extremity as shown, making connections with the mercury in the tube and at the same time support- ing the electrode rigidly. Fig. 2 shows diagrammatically the method of agitating the cell and connections as measurements were being made, a is the calomel electrode provided with a stop- < Loc cit (2). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knight, Henry Granger, 18
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
