Fred T. Hodgson · Frederick J. Drake and Co. · leaf 464
J?ig. 7. -Rairborne System of Erecting Columns. in these boxes, and adjusted by gauges to within one ortwo inches of the sides. The concrete is laid andrammed, about six inches at a time, with small handrammers. The open side of the box is built up bybattens fitting into grooves in the permanent… … Ffe. 8.—Wood Centering and Ransome Steel Bars for 50-footFloor Span. inch diameter and are dropped down over the top ofthe steel rods. They are spaced down two-inch centres HOW TO USE THEM 461 at the bottom and top. to twelve-inch centres in thecentre of length of the column, and are intended…
