. Concrete silos... UNIVERSAL PORTLAND CEMENT CO. 35 Work Under Home Supervision:—If neither a good contractor nor a good foreman is available, the farmer may undertake the build- ing of the silo, but he must pay close attention to the details of the work. The inexperienced worker with concrete too often considers cement a sort of magic material which may be used without precau- tion and still secure first class work. On the contrary, precautionary measures are constantly necessary and the directions given on the following pages must be carefully complied w^ith if the best results are to be ob

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