. Bulletin. Science. Figure 38.—One of the first forms of the AlUance machine. Note the brushlike cur- rent collectors. Reproduced, with permission of the publisher, from O. Mahr, Die Entstehung der Dynamomaschine (vol. 5 of Geschichtliche Einzeldarstellungen am der Elektrotechnik, Berlin, J. Springer, 1941), p. 89, fig. 61. tests were held at South Foreland during the winter of 1876-1877 under the joint supervision of Professor Tyndall, successor to Faraday as scientific adviser to Trinity House, and James N. , chief engineer of Trinity House. The results of these tests (see table 1)
. Bulletin. Science. Figure 38.—One of the first forms of the AlUance machine. Note the brushlike cur- rent collectors. Reproduced, with permission of the publisher, from O. Mahr, Die Entstehung der Dynamomaschine (vol. 5 of Geschichtliche Einzeldarstellungen am der Elektrotechnik, Berlin, J. Springer, 1941), p. 89, fig. 61. tests were held at South Foreland during the winter of 1876-1877 under the joint supervision of Professor Tyndall, successor to Faraday as scientific adviser to Trinity House, and James N. , chief engineer of Trinity House. The results of these tests (see table 1) showed the new dynamo to be far superior to the magneto generator.'- Of the two dynamos, the Siemens ta ;i — ~ fp'!-!^ —] d'dE m'- t^. Figure 39.—The usual form of the Alliance generator as provided with a commutator. From Annales tclegraphiques, 1862, vol. 5, pi. 5. the magneto generators, which had already been found reliable. The attention of Trinity House was again brought to the new machines in 1876 by an exhibition of the Loan Collection of Scientific Apparatus held at South Kensington. There one could see the dynamos of Gramme and Siemens together with the magnetos of the Societe I'Alliance and of Holmes. Trinity House thereupon invited the manufacturers to a trial com- petition to determine the kind of apparatus best suited for the new lighthouse at Lizard Point. The 1, „»; 1, :*[]:"Lr. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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