Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 90
n the following paragraphs. The Duddell Oscillograph.—The com-plete oscillograph outfit (see the Plate) con-sists essentially of a modified moving-coilgalvanometer combined with a rotating orvibrating mirror, a moving photographicfilm, or a falling photographic plate. Thegalvanometer portion of the… … Diagrammatic Slietch of Worliing Parts of DnddellOscillograph parallel conductors, s, s formed by bendinga thin strip of phosphor bronze back onitself over an ivory pulley P. A spiralspring attached to this pulley serves to keepa uniform tension on the strips, and a guide-piece L limits the length…
Electrical engineering
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