. Carnegie Institution of Washington publication. TISSOT METHOD. 63 The very thin metal flap rises when the air is drawn in; when the air is blown out this metal flap drops back in place, making a contact in the two mercury cups a and a'. If wires are led from these mercury cups to a signal magnet and battery, the respiration can be recorded on a kymograph. Spirometer.—The spirometers used with the Tissot method are also of special design, very well made, and the parts are easily adjusted. Figures 26 and 27 show the 50-liter and 200-liter types respectively. The bell of the spirometer, which i
. Carnegie Institution of Washington publication. TISSOT METHOD. 63 The very thin metal flap rises when the air is drawn in; when the air is blown out this metal flap drops back in place, making a contact in the two mercury cups a and a'. If wires are led from these mercury cups to a signal magnet and battery, the respiration can be recorded on a kymograph. Spirometer.—The spirometers used with the Tissot method are also of special design, very well made, and the parts are easily adjusted. Figures 26 and 27 show the 50-liter and 200-liter types respectively. The bell of the spirometer, which is made of very thin copper, is cylindrical in form, with a conical top, and is suspended in a water-bath between the double walls of a hollow cylinder. The height of the 50-liter bell is 60 cm. and the diameter 33 cm., while the height of the 200-liter bell is 73 cm. and the diameter 65 cm. An opening at Z permits the insertion of a rubber stopper with a thermometer and tube for sampling. This rubber stopper majr be removed when the spirometer is emptied after an experiment. The air coming from the subject or from any other. FIG. 25.—Apparatus for registering the respiration-rate used with the Tissot method. The flap has attached to it two platinum points which dip into the mercury-containing cups a, a'; the flap rises and falls at each respiration. source enters the spirometer at the bottom through a three-way cock, A. This three-way cock may also be so turned that the air passes out into the room. The major portion of the weight of the spirometer bell is counterpoised by the weight R. The automatic adjustment of the counterpoise is, however, accomplished in the follow- ing manner: A glass cylinder, C, is made of such size that when filled to the level of the water in the spirometer, the weight of water in the cylinder exactly equals the increase in weight of the spirometer bell, due to its new position. When the bell rises or falls, water is added to or taken from the cyl
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