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A 1:3:6 mixture of concrete was used; it was run from the mixer into dump-cars and deposited in the form through chutes, three of which were provided for each 50-ft. section, the average length. The concrete was mixed wet, and was not rammed; the stone was spaded back from the face, and no facing mixture or facing diaphragms were used.
Of course, we saw the place at its worst, for the best summer months had passed. The hut itself had been erected as a magnetic observatory and it contrasted shabbily with our 50-ft by 25-ft. palace. We did not finish clearing the snow away, although with so many willing workers we made considerable progress.
An effort to control the cracks was made by placing corrugated-iron diaphragms in the form, dividing each 50-ft. section into three parts. The diaphragms were 1 ft. wide, and were placed with the outer edge 1 in. in from the face of the wall, but in the copings they were omitted.
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