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Tracts on vaults and bridges : containing observations on the various forms of vaults; on the taking down and rebuilding London Bridge : and on the principles of arches: illustrated by extensive tables of bridges : also containing the principles of pendent bridges, with reference to the properties of the catenary, applied to the Menai Bridge : and a theoretical investigation of the catenary / Samuel Ware
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37

Ounces.

Brought up 987

Weight traversing the road as ca-valry, oxen, per foot super-ficial - 640*

Total weight, per foot superficial 1627

Required the area of the section of thependent bearers ?

Then let w = the whole weight which maybe supported by the pendentbearers, per foot superficial.g — the weight of one foot long,inch square, of the pendentbearers in ounces.n — the number of square inchesin the area of the collectedsections of the pendentbearers.

f = the practical strength of ironor one-fourth of the weight/ in ounces, which would tear

asunder an inch square ofthe pendent bearers.

* That is, 40lbs. upon a foot superficial, or one manin four feet; in crowds, 8 men will stand in 9 feet.

D 3

 
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