Paris subway insulators

[Trade Journal]

Publication: Electrical World

New York, NY, United States
vol. 14, no. 9, p. 147, col. 1-2

The Electric Subways of Paris.

At the close of 1888, the Municipal Council of Paris granted concessions for electric lighting in various quarters of Paris to the Edison, Popp, Sencier, Surry-Montaut and other companies, reserving to itself the right to put in a central station of its own at the Halles market.

Operating under these privileges, the first three companies have put in underground conduits, the types of which are shown in Figs. 1 to 4, taken from an article by M. Laffarque in La Nature. These subways are built of cement, sand and lime mixed, in which small ducts or troughs are made, above which is a bed of sand, on which rests the