Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 97
ppose awhole line of posts put 10 feet apart from centre to centre and support-ing one line or two parallel lines of light iron or steel rails or of T iron,the centre of those rails or T iron acting as such, being supported in thecentre of the span of 10 feet by the rigid truss and you will have…
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