London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 502
t-ironheads. Thus the tie-beam is well supported; the truss haswidth enough to withstand all lateral strains ; and the greatestlength of the principal rafter {fg. 106.f tog) may even becambered by screwing up the rod at //. It is in this part thatroofs so often fail; and in many cases it is owing…
Architecture
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