struction, except that the A, figure 1,is a cylinder with openings cut connects with the switch is provided with or half a dozen of such cylinders may be kept for the admission of currents of air, and a latter is inverted upon the shaft in order to long flanges upon the top at their inner edges,… … being arranged in such relation to the roeking to the retort and over the entire length of the or swinging frame, which carries the alarm dirrect the current in an opposite direction. cylinder, the portion of the tube within the bell, that as either of tne rods are raised for The wings of these fan…
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