Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 330
hen opened to permit its ready clos-ing in case of fire, we provide a substantial check that stops thesash at an angle of about forty-five degrees. This check can bethrown out at any time to allow the sash to be completelyrevolved for cleaning. The pivoted sash is so hung that aboutsixty per centum…
Building materials
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