Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 474
it possible to fit any localconditions which the par-ticular job may develop. Thestandard driving mechanismof Callahan Operators is aworm and gear assembly, tobe operated by a hand chainor a vertical shaft. Whenthe shaft is used an addi-tional set of gears and ahand wheel are installed. Simple… … (Callahan Coinave Arm inuse luilh I fitter pivoted sash. MOTOR DRIVE When long runs of ventilators are installedin buildings or the ventilators are well abovethe floor, it is often desirable to operate orcontrol all of the vents from a central point.In such cases the Callahan motor drive is…
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