s, and the object of the corrugated hoop iron isevidently to cause it to bend, and to avoid the possibility ofa straight joint all around the circumference of the column.In Figs. 3 and 4 the arrangement is somewhat different. Inthe place of the corrugated hoop iron, fillets of wood, B B,are… … incasement of column B showed a crack about 3 feet inlength. This was caused probably by the expansion of heatedair or steam within the hollow space, the experimentershaving inadvertently omitted to form escape holes in theconcrete casing, as had been intended. No signs of injury tothe incasement…
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