. Bulletin. Science. \ontirr «/<â hfihifiiv. Figure 40.âResults of Le Roux's study of the relation between the speed of rotation and the voltage (open circuit) for varying numbers of coils on the armature of an Alliance generator. From F. P. Le Roux, "Etudes sur les machines magneto-electriques," Archives des sciences physiques et nalurelles, 1856, vol. 33, figs. 1-3 (following p. 263). proved itself to be electrically and mechanically superior. In addition to being cheaper as well as less bulky, the Siemens dynamo could produce twice as many candles per horsepower as its best ma
. Bulletin. Science. \ontirr «/<â hfihifiiv. Figure 40.âResults of Le Roux's study of the relation between the speed of rotation and the voltage (open circuit) for varying numbers of coils on the armature of an Alliance generator. From F. P. Le Roux, "Etudes sur les machines magneto-electriques," Archives des sciences physiques et nalurelles, 1856, vol. 33, figs. 1-3 (following p. 263). proved itself to be electrically and mechanically superior. In addition to being cheaper as well as less bulky, the Siemens dynamo could produce twice as many candles per horsepower as its best magneto competitor. By examining the tabulation, the respective proportions of the Holmes magneto and the Siemens dynamo can be seen to be as follows: bulk, 114 to 1; weight, 28 to 1; total light produced, 1 to 5; light produced per horsepower, 1 to 4; cost per unit of light, 9 to 1. Obviously, the magneto generator could not compete with the new dynamo generator, and Trinity House decided to install the Siemens dynamo instead of the Holmes generator at Lizard Point. Hippolyte Fontaine, of the Gramme firm, protested to the editor of Engineering that the trials were unfair, since the Gramme machine used in the tests was the 1874 model rather than the new type cTatelier (actually, the company had refused to submit a model). Fon- taine quoted Trescaâwho had tested the new Gramme machineâas having found that 2 hp. produced 7,000 candles. Fontaine further went on to describe PAPER 30: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: m 367. 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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