Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 267
" If this be true of an arch of reasonable limits. The following examples have been mostly worked out on a scale of masonry, each voussoir of which has been five feet to the inch, and five tons to the inch. exactly dressed to the templets, and which is subjected only to the gradually applied strain… … Fig. 1 is a roof principal with a horizon- 1 equally distributed load, equivalent to five tal bottom chord. The span is 100 feet tons on each apex of the bracing. The rise, 12.5. It sustains a permanent and | left hand half represents a system of verti-
Engineering
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