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abutment acute angle apply arch stones bed and soffit bed-joints bed-moulds bevels required bottom bed bridge centre g circle course of arch-stones courses of bricks cross-joints divide draw the arc draw the lines drawing a line eleva ellipsis extrados face-moulds finding the bevels found by drawing half the elevation horizontal centre horizontal courses intersect the joint intrados intradosal line JOHN HART keystone length of stone line a b line b j long stones manner as shewn mould figure number of springers number of stones observed obtuse parallel straight-edge parallel to a d perpendicular to a b plane previous plates principle right angles segment semi seven springers shewn at figure shewn at plate short quoins skew SKEW ARCH skew-backs soffit bevels spiral courses springing square joints square section straight line take the distance templet top bed transfer twist winding
Page v - ... of adapting the explanations of drawings to the understandings of those engaged in their execution ; for much of the value and beauty of a design depends upon the workmen being acquainted with the principles of the construction upon which they are engaged.
Page v - My principal aim throughout has been to simplify the construction of oblique arches as much as possible, which I trust will be seen upon an examination of the plates and their definitions. I have been more anxious to explain them in language suited to the capacities of the men engaged in the execution of them, than to embellish the Work with scientific terms, (which, with many, would require more learning than a knowledge of the work itself,) thus rendering it what it professes to be, a useful reference...
Page 23 - ... serait avantageux de substituer l'arc de cercle au plein cintre pour augmenter la stabilité d'une voûte biaise. Je crois utile de rapporter sur cette question l'opinion de quelques-uns des ingénieurs qui sont considérés comme les plus expérimentés. On lit dans M.
Page 29 - I will therefore give one more in accordance with their wishes, whereby they will be able to accomplish the work, without making a drawing for any part of it.