put wire guard over hopper to prevent gravel, etc., getting in. The trouble with ice along eaves andin gutters is done away with, but this style is not suitable unless the building is sufficiently heated to prevent frost reaching thedown-pipes during winter. We offer for guidance two… … Specificaiiou No. i.—Layone ply of dry felt or sheathing,over this two plies of tarredfelt, medium weight, swabbedbetween each sheet with hotpitch, then swab the whole sur-face with a good coat of boilingpitch; lay another two plies oftarred felt, swabbed betweenslieets, and a second flowing coatof…
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