Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 198
ffords an opportunity forreplacing the upper part. The pieces which are immersed willlast a great length of time, especially when of elm; for it is awell-established fact, that timber is less durable when subject to FRAMING. 183 alternate dryness and moisture, than when it is either continually-wet… … Fig. 231. 322.—Centres for stone bridges. Fig. 231 is a design for acentre for a stone bridge where intermediate supports, as pilesdriven into the bed of the river, are practicable. Its timbers areso distributed as to sustain the weight of the arch-stones as theyare being laid, without destroying…
Carpentry · Architecture
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