Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 288
Und Finvsh/. … Detail at Rid^e. DETAILS OF CONCTRUCTION OF THE HELLIWELL PATENT PUTTYLESS GLAZING While this system has not the special advantages of the double gutters of theHelliwell patent B bar in preventing drip from condensation, it must appeal toarchitects who have used or specified Skylights of somewhat…
Building materials
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