Morton, Edward Reginald, 1867- · New York : E.B. Treat & Co. · leaf 67
Fig. 14. Mica Regulator—in accessory bulb above. The special devices for lowering the vacuum may bedivided into two main classes. (a) Those in which gas is liberated from some sub-stance placed inside the tube, or, what is more common,in a small accessory bulb or chamber communicatingwith it. A…
