Fig, 1, Richardson* Standard Solid-Panel Door,Light Oak FiNJSia. Fig. 2, Section tukcugh Richardson* Door and Frame. This shows the core of three thicknesses, laidcrosswise, covered wkh asbestos; also, the seam-less, hydraulic staaiped panel. The^e single sheetson each side lap in a Kroovc on all… … FlC. 3- Richardson Stand.\rd Glass- Pa\El Door, Old Copper Finish. The Underwriters Standard for fireproof doors is based on a three-ply, built-upwood core, covered with sheet steel locked on. The Thorp way of interpreting this specification is to line the three-ply wood corewith heavy sheet…
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