Scientific American Supplement, No. 443, June 28, 1884
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When once the cables are in place the longitudinal opening isstopped up with cement mortar, and in this way a very tight conduit isobtained whose hardness increases with time. The value of the systemtherefore depends, as in all cement work, on the care with which themanufacturing is done. Experiments have been made with the system at Toulouse, by theMinister of Post Offices and Telegraphs, and at Lyons, by the GeneralSociety of Telephones. Here, as with all similar questions, no opinioncan be p...ronounced until after a prolonged experience. But we cannothelp setting forth the advantages that the system offers. These are, in the first place, a saving of about 50 per cent. Over iron pipe, andin the second, a better insulation, and consequently a betterprotection of the currents against all kinds of disturbance, since anon-conducting mass of cement is here substituted for metal. * * * * * ELECTRICITY APPLIED TO HORSE-SHOEING. "There is nothing new but what has been forgotten, " said MarieAntoinette to her milliner, Mdlle.
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