Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, Comstock · leaf 317
above, as it is undesirable to put any weight on the arch until 290 BUILDING CONSTRUCTION. (Ch. VI) the mortar in the joints has become hard. A center is usually madewith two ribs cut out of plank and securely spiked together, and thebearing surface formed of cross pieces about i by 2 inches in… … Fig. 147.—Stone \oussoiis for Flat Arch. \ertical FaceJoints. Sloping Interior Joints. ribs should be used. The center should be supported on woodenposts resting on blocks set on the sill or some sufficient support below.It should not be removed until the mortar in the arch joints has hadample time…
Building · Carpentry · Masonry
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