rors incidental to the working of mercury air pumps of which the cocks are obliged to be worked by hand. Lastly, it can maintain the vacuum indefinitely. The proportions of this machine, which are limited to the size of a laboratory instrument, may be augmented accord- ing to whatever requirements… … sue is impermeable to gases. The utility of the device is This machine is composed of two reservoirs of cast iron, prinsipally found in testing silk and other fabrics used for A A, which counterpoise each other, and are supported by the pulley, B. They communicate with two glass balloons, C, by…
Patents · Center · Colors · Consists · Improved · Rapid transit · Emery · British patent · White light · Working men · Double convex · Scientific American · Centrifugal force · Union iron · Sewing machine · Sir goldsworthy
Internet Archive · Public domain (published before 1931). Free to use for anything.
