. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Fig. .029. Fig. 5?0. Fig. 526. Fi-. J27. F«. .52S. III. That represented in Jig. 528., wherein tlie power P is placed between the weightand the fulcrum, in which case the power and the weight act in contrary directions. Iifil. in considering the fulcrum of t ese three sorts of levers, we must notice, as athird species of power introduced for creating an equilibrium between the others, I stThat in which the directions of theweight and of the powers c
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Fig. .029. Fig. 5?0. Fig. 526. Fi-. J27. F«. .52S. III. That represented in Jig. 528., wherein tlie power P is placed between the weightand the fulcrum, in which case the power and the weight act in contrary directions. Iifil. in considering the fulcrum of t ese three sorts of levers, we must notice, as athird species of power introduced for creating an equilibrium between the others, I stThat in which the directions of theweight and of the powers concurin the point R (fff. 529.). 2d,That in which they are parallel. 12fi2. In the first case, if fromthe point R (fi/s. 529. and 530.)we draw parallel to these directionsO/n Hn, the ratio of these threeforces, that is, the power, the weight,and the fulcrum, will be as the threesides of the triangle 0»iR, or itsequal 0« R; thus we shall have P: Q, : R::;«R : R« : OR; and asthe sides of a triangle are as thesines of their opposite angles, bytaking OR as the radius we shall have P : Q,::sin. ORw : sin. OR? if from the point O two pe
Size: 2018px × 1238px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectarchitects, booksubjectarchitecture
