Society of Glass Technology · [Sheffield] · leaf 632
U.S.A. (Brit. Pat., No. 158632. November 5th, 1919).—An automatically-operating damper controlling apparatus of thetype in which the damper is moved by a reversible electric motorwhich is itself controlled by the movements of a manometer, or likeindicating device, in direct communication with the… … Fig. 161. provided with a lever, e, which oscillates between contacts, /, andcontrols the motor, h, through the electro-magnetic relays, g, thedamper being operated by worm-gearing, o, k, and cable anddrum, q, p. In a modification, the damper is suspended from ascrewed rod which engages with and is…
Glass
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