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Correspondence

Sir,-With reference to Mr. Voce's sand-box test, as described by him in the June number of this periodical, I believe I could carry out the test if the sides of the box were of leather, canvas, or some such material; but his box has stiff sides; assuming they are of half-inch boarding, say a foot deep, how did he bend up part of these sides to conform with the bent-up portion of the base ?