Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 406
ame. In frames for flat segmental arches of great success. The frame then consists of a span as great as sixty or seventy feet the tie beam and two, or if great strength and rise of about one-fifth the span, as is required, three radial struts which sup- also for ovals of several centres, this port… … Fig. 2. which, for an arch of seventy feet span which shall meet all the requirements of and fifteen feet rise, would be about strength, lightness and economy. The forty-five feet from the circumference, rib in this case again consists of a hori- go no further than the tie beam and are zontal tie…
Engineering
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