. Bulletin. Science. Figure 34.—Holmes' experimental magneto generator that was demonstrated at Blackwall. From La Lumiere eledrique, September 23, 1882, vol. 7. p. 298. went into operation on December 26, 1863, and the results were so encouraging" that a pair of the machines were installed in the north lighthouse in 1865.'* Le Roux, in published preliminary engineering reports on the success of the installation at the light- houses, questioned the reliability of the new system, pointing out that, despite previous hopes, the light from the arc was not much brighter than that from oil; als
. Bulletin. Science. Figure 34.—Holmes' experimental magneto generator that was demonstrated at Blackwall. From La Lumiere eledrique, September 23, 1882, vol. 7. p. 298. went into operation on December 26, 1863, and the results were so encouraging" that a pair of the machines were installed in the north lighthouse in 1865.'* Le Roux, in published preliminary engineering reports on the success of the installation at the light- houses, questioned the reliability of the new system, pointing out that, despite previous hopes, the light from the arc was not much brighter than that from oil; also, Reynaud, in a formal report to the French government, concluded that the two lighthouses were too expensive for ordinary use but were valuable where great brilliance was required.*' Notwithstanding these objections, another installation was made at Cap Gris Nez, near Calais, in February 1869, and other Alliance installations were made outside France— ^< Les Alondes, 1864, vol. 4, pp. 57-61; A. Guerout, "L'Eclai- rage electrique du Port du Havre," La Lumiere e/ectrique, 1881, vol. 4, pp. 132-136; Cosmos, 1866, ser. 2, vol. 4, pp. 7-11; L'Annee scientifique, 1866, vol. 11, pp. 48-56. == F. P. Le Roux, "Les Machines magneto-electriques frangaises et Tapplication de Telectricite a Teclairage des phares," Bulletin de la Societe d'Encouragement pour I'Industrie Naticnale, 1867, vol. 14, pp. 677-711, 748-790; Leonce Rey- naud, "Experiences comparatives des deux systemes d'eclairage des phares a I'huile et a la lumiere electrique, consideres au point de vue economique," Bulletin de la Societe d'Encourage- menlpour I'Lndustrie Nationale, 1867, vol. 14, pp. llb-ll')\ Cosmos, 1866, vol. 4, pp. 7-11. when the Suez Canal was opened in 1869 a lighthouse using Alliance equipment was set up at Port Said, and two years later a similar installation was made at Odessa, in southern ;^ The brightness of the arc had been increased, and it was now c
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