Vogel system, in which the conduit is composed of rolled steel bars and is but ten inches deep, is illustrated and described in St. Ry. Jour. (See also Eng. News, Jan. 31, 1891, pp. 104-5.)
The Vogel cable railroad systems
St Ry Jour
Street Railway Journal ; p 28
1891
Aufsatz (Zeitschrift)
Englisch
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