Simpson, F. M. (Frederick Moore), 1855-1928 · London, New York [etc.] Longmans, Green, and Co. · leaf 47
cker. ^ A stone was placed on the rocker, a lever wasinserted under the central cross-bar, which is higher than the • Some of these rockers are now in museums, and until recently were regardedas centres for arches. One, in Professor Petries Museum at University College^London, came from the… … others, and one end was raised by levering down the other.Under the raised end was inserted a block. A reverse move-ment brought the rocker on top of the block, and at thesame time allowed anotherblock to be put under theopposite end. By this meansthe stone rose. The operationtook place lengthways…
Architecture
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