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Sconce built at Warnemünde, Rostock in 1661 (detail from a map from 1670–1680) The Engelse Schans (English Sconce) of 1627 in Lievelde, the Netherlands (photo 2008). A sconce is a small protective fortification, such as an earthwork, often placed on a mound as a defensive work for artillery. [1]
A balancing arm (the forearm) has on one side of an axis a small counterweight and on the other side a lamp cap. These parts are lifted by a second bigger balancing arm (the upper arm) that has on the other side of a second axis a heavier counterweight. The lamp designed by Edouard-Wilfrid Buquet in 1927 works in this way.
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