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After extended hospital use of the ether-inhale devised by Robert H. Ferguson, M.D., of East Orange, N. J., for the maintaining of surgical anesthesia by the open-drop method, and having become thoroughly impressed with the advantages of its use, I employed the principle of construction in a modification which I believe has several advantages over the original.
Using the principle of the Ferguson inhaler as a working base, I have added to it the simple and well-known celluloid gas chamber and rubber mouthpiece of the ordinary nitrous oxid gas-inhaler.
The apparatus is not so complicated as one would suppose on first inspection. It consists of a double copper-wire frame. The inner frame (A, Fig. 1) is a convex frame of four wires fastened to the base wire; the outer frame (B, Fig. 1) is of a heavy wire ring supported by four wire legs. This is attached to the celluloid
PRUDDEN CE. MODIFICATION OF THE FERGUSON OPEN-DROP METHOD ETHER-INHALER, AND MODE OF ETHERIZATION. JAMA. 1912;LIX(21):1870-1872. doi:10.1001/jama.1912.04270110284010