November 3, 1900


Author Affiliations


JAMA. 1900;XXXV(18):1138-1139. doi:10.1001/jama.1900.24620440012001c

This apparatus consists of a tank 6 inches high and 4 inches in diameter. It has a brass barrel running through the center and closed at the lower end by a cone-shaped piece of rubber having a slit in its lower extremity. The piston which runs up and down in the barrel admits air through the rod by drawing it up and is prevented from escaping by a valve which closes when the piston is sent home. The air is then forced through the slit in the rubber stopper and again prevented from returning into the pump, by closing hermetically, as it were. Thus, the cylinder or tank holds the air indefinitely, and a pressure of thirty pounds can be reached, which, however, is not necessary, as fifteen or twenty pounds is amply sufficient for all ordinary purposes. A peculiarly arranged apparatus is attached immediately above the handle, which acts

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