San Francisco : Architect and Engineer, Inc · leaf 523
Thereare few, however, in use on the Pacific Coast. Summing it all up, common sense will tell you that the wheel prin-ciple sloat is the only improved principle to consider. Any of the wheeltype sloats is better than any sliding sloat. Lubrication reduces any ofthe principles by a certain… … DECEMBER, 1926 lOr, pound pull; the metal tniwler on w(jo(l would letjuire a 20-pound pull;and the wheel type would require an 8 1/3-pound pull, but with theleverage principle this is further reduced to al)out one pound. In my previous article I explained the basic principle of the three-and…
Architecture · Building
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