ery great rigidity, in which sides of which are curved in the arc of a circle, it be- Fig. 5 comprises eight 1 inch tubes and eight 34 inch the metal tubes supply the tensile strength which the ing intended, by the swinging of this plate, to direct concrete lacks. It is well known that concrete… … the advantages of cast iron on the the tubes may readily be filled with moss litter, chaff, outer surface with a steel and con- sawdust, or other non-conducting material, and thus there will be produced, at small cost, a building that crete core. The latter shows a col- it will be possible to live…
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