London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 75
of two distinct forces; namely, one actingperpendicularly downwards, and the other horizontally out-wards. This being the case, I determined to ascertain, as accu-rately as I could, by means of weights, the exact proportion inwhich these two forces acted upon every voussoir throughout anentire… … (c d\ under which was a stool {ef). Two movable pulleys wereattached to the frame; one at the top at g, which was kept inits place by the weight h ; and the other {i) resting on one endof the stool, and having a weight {k) to prevent it from slipping;with the support /, at rf, to raise or depress…
Architecture
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