I was now face to face with the castle moat, which was, indeed, very wide and very deep. Alas! I could not swim, and my chance of escape seemed of a truth hopeless, as, doubtless, it would have been had I not espied a boat tied to the wall by a r... Read more of Crossing The Moat at Math Puzzle.caInformational Site Network Informational
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Self-supporting Roofs








In putting up, for instance, self-supporting roofs, or ceilings with wide spans, and steeples or towers, the bridge principle of trussed members should be understood.
The most simple bridge or trussed form is the well-known A-shaped arch.
Fig. 235. Fig. 235.






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