San Francisco : Architect and Engineer, Inc · leaf 363
s. There areabout thirty-five hundred produc-ers of building materials of allclasses doing a national businessand about as many more import-ant firms offering their productsover more restricted areas. So we have on one side of thefence, so to speak, eight thousandarchitectural firms who must… … A) Worm geardrives cogs on tilt-ing device whencord is pulled. Pins at end of top rail Rt intoopenings. (C) Sheave pulley---prevents cordslipping. The New WORM GEAR
Architecture · Building
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