. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. he Government to adopt the thicknessesof walls now directed to he used. Theseare based upon rules deduced from sec-tions I5l2et seq. Inasmuch, however, asit was thought that builders might heliable to mistakes in extracting the squareroot of the sum of the squares of theheijihts and lengths of walls, tables wereinserted in the Act to meet all the formula t = Jp will be a useful guide in adjusting the thickness of which t =
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. he Government to adopt the thicknessesof walls now directed to he used. Theseare based upon rules deduced from sec-tions I5l2et seq. Inasmuch, however, asit was thought that builders might heliable to mistakes in extracting the squareroot of the sum of the squares of theheijihts and lengths of walls, tables wereinserted in the Act to meet all the formula t = Jp will be a useful guide in adjusting the thickness of which t = thickness, h and I respectively the height and length, d the diagonal formedby the height and length, and n a constant determined by the nature of the building. Inthe tables for dwelling-houses, the constant multiplier (n) used was 22; for warehouses, but for the interference in committee of the present Right Hon. Member torOxfordshire (Mr. Henley), for what scientific reasons it is difficult to sav, the constantmultiplier for public buildings would have been 18. M hen h is less than — the constants are 27, 23, and 20 Fig. C09. \ \ E ^^ ^ ;- ^ \ ¥ Vh ?/ ^ f ^v /, / ^V y ; / X^ « 1/ \^ c D Fis. 610. Of the of Piers or Points of Support. Let A BCD {fg. 610.) be a pier with a square base whose resistance is requiredin respect of a power at M acting to overturn it F horizontally in the direction IMA, or obli(]uely inthat of NA upon the point D. Considering thesolid reduced to a plane passing through G, thecentre of gravity of the pier, and the point U,that upon which the ))ower is supposed to causeit to turn, let fall from G the veitical cutting thebase in I, to which we will suppose the weight ofthe pier suspended, and then supposing the pierremoved, we only have to consider the angularlever BDIor HDI, whose arms are determinedby perpendiculars drawn from the fulcrum 1),in one direction vertical with the weight, and inthe other perpe
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