. Carnegie Institution of Washington publication. TENSION-EQUALIZER UNIT. 23. of mm., this tube being fire-polished at both ends. A small hole is cut in the end of a pure-gum finger-cot b, which is then slipped over the glass tube and tied carefully with silk thread. At the other end of the tube a one-hole rubber stopper, c, is attached. The finger-cot is then turned inside out and pulled back on itself in such a way as to be drawn over the rubber stopper, to which it is tied with silk thread. A hole is next made through the rubber stopper, in which a piece of small-bore glass tubing d can
. Carnegie Institution of Washington publication. TENSION-EQUALIZER UNIT. 23. of mm., this tube being fire-polished at both ends. A small hole is cut in the end of a pure-gum finger-cot b, which is then slipped over the glass tube and tied carefully with silk thread. At the other end of the tube a one-hole rubber stopper, c, is attached. The finger-cot is then turned inside out and pulled back on itself in such a way as to be drawn over the rubber stopper, to which it is tied with silk thread. A hole is next made through the rubber stopper, in which a piece of small-bore glass tubing d can be inserted, to which a short piece of rubber tubing is attached. By blowing air from a hand bulb through the rubber tubing, the finger-cot is inflated; the closing of the pinch- cock e serves to keep the air inclosed in the finger-cot. When the appliance is to be used, the deflated nose- pieces are inserted into the nostrils and air is forced into each nosepiece in turn until they are sufficiently inflated to fit into the inequalities of the nostrils. The nosepieces should be tested for tightness by inflating them while they are entirely under water. If any part of the nosepieces leaks, bubbles will rise. The tightness of the fit in the nostril should also be tested by having the subject exhale against pressure. The subject first inhales deeply; the palm of the hand or a piece of cardboard is then placed against the opening of the three-way valve, and the subject attempts to exhale. If a leak occurs, it is detected by the sound of air escaping between the nostril and rubber membrane of the nosepiece. The best test is made by covering the edges of the nostrils with soapsuds and applying pressure. Bubbles appear when there is a leak. The nose- pieces are attached to the three-way valve by a piece of rubber tubing and a tube, to which are attached two metal tubes of approximately 6 mm. internal diameter. When the nosepieces are used, a tight closure of the mouth is some- times o
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
