. Carnegie Institution of Washington publication. 62 COMPARISONS OF RESPIRATORY EXCHANGE. that when placed in the nostril the other end can be easily attached to the connecting piece B (fig. 23) without stress being put upon the nostril. The view at A (fig. 24) shows it as it appears from above when placed in the nostril and at B from the side. Valves.—The valves used in the Tissot method are the Thiry Two of these are shown in figure 23 (C and C). A very thin brass flap, D, hinged on one edge, rests against a brass tube, E, 15 mm. in diameter. The edge of the tube is tapered where th
. Carnegie Institution of Washington publication. 62 COMPARISONS OF RESPIRATORY EXCHANGE. that when placed in the nostril the other end can be easily attached to the connecting piece B (fig. 23) without stress being put upon the nostril. The view at A (fig. 24) shows it as it appears from above when placed in the nostril and at B from the side. Valves.—The valves used in the Tissot method are the Thiry Two of these are shown in figure 23 (C and C). A very thin brass flap, D, hinged on one edge, rests against a brass tube, E, 15 mm. in diameter. The edge of the tube is tapered where the flap D rests against it, so that there is a minimum amount of surface in contact between D and E. The brass tube E is inserted in a collar F, which screws into the ring G. This ring encircles a glass tube, H, 23 mm. in diameter and 30 mm. in length. A collar, K, with attached brass tube, «/, fits over the end of the glass tube H. The glass tube is cemented into the parts G and K by sealing-wax. The tee-piece B joins the two valves and the nosepieces. When the valve is in action, the air enters. FIG. 23. FIG. 23.—Nosepieces and valves used with the Tissot method. A, A, nosepieces; B, tee piece connecting two valves C, C; D, flap of valve; E, inlet of valve; J, outlet of valve; H, glass tube to which are sealed brass shoulder, K, and ring, G; F, threaded part fitting into G; L, part of apparatus for registering respirations; b, thin copper flap to which are attached two electrical contacts. FIG. 24.—Modified glass nosepieces. A, view from above when placed in the nostril; B, view from side when placed in the nostril. at E, raising the flap D, and leaves at J. The valves and nosepieces are supported upon the head of the subject by means of straps or strings connecting the valves with a small round cap which fits over the head. With this arrangement the nosepieces can be forced into the nose and it is possible for the subject to maintain any position. Apparatus for registr
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
