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DESCRIPTION OF APPARATUS
The inhaler consists of two parts, a mixer and a combined face-piece and valve-holder.The mixer consists of a box (6), of shape as shown in Figures 1 and 2, and on cross-section, square. This box has on it a drip-cup (2) with a controller (1), for either ether or chloroform. On one side of 6 and near top is a rheostat (26) for controlling current admitted to the heater inside (heater to be described later). On the lower part of 6 is a thermometer for showing exact degree of temperature within 6. At bottom of 6 is a drain-cock (7) for draining away excess of anesthetic.In Figure 2, which is seen to be a section of 6 on a plane perpendicular to plane of bottom, 6 is seen to be divided into an upper and lower chamber (6' and 6") by an electric heater (21).
PORTER JY. INHALER FOR GAS-OXYGEN, GAS-OXYGEN-ETHER, GAS-ETHER, ETHER OR CHLOROFORM. JAMA. 1912;LVIII(23):1752-1753. doi:10.1001/jama.1912.04260060101007