Stomach Pump
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“It consists of a common metallic syringe, A, screwed to a cylindrical valve box, B, which contains two ovoid cavities, in each of which there is a loose, spherical metallic valve. The ends of the cavities are peirced, and the valves fit exactly, either of the orifices. Thus it makes no difference which end of the valve-box is upturned, the valve falling down and closing the orifices in either direction. The flexible india rubber tubes, C D, are attached to the opposite ends of the cavities.” —Comstock, 1850
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J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 162
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