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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
found in the more complex and difficult work of raising the Egyptian Obelisk in the Plaza of St. Peter's at Rome, by Domenic Fontano, A. D. 1586. The Arc de l'etoile and the Eglise de la Madeleine are triumphs of the first Napoleon. on which the same style of scaffolding was used. The tendency in the United States is to the use of the derrickcrane, whose simplicity and efficiency leave little to be desired. The extension of the Treasury Building in Washington, under the conduct of A. B. Mullet, was made by colossal stones; its monolithic character is said to be second only to the Church of St. Isaac's at St Petersburg, Russia. The derrick-crane was used on this building, and on the Capitol Extension also. Fig. 4648 represents a hanging scaffold contrived by Perronet for the workmen employed in dressing and pointing the masonry of the arches of the bridge at Orleans. It was suspended from a frame which straddled the parapet, and was rolled from place to place as required.