. Bulletin. Science. 5W«5 Figure 68.—Gramme's 1876 type (Tatelier dynamo for use with arc lights. From Revue industrielle, February 9, 1876, p. 57. magnets grouped in the form of a triangle on each side of the armature, and each group had a common pole-piece. This machine weighed 700 kg. and measured meter square by meter high. There were 180 kg. of copper wire on the electro- magnets and 40 kg. on the armature. This large generator normally produced a light of 500 Carcel units, but it was claimed that this amount of light could be almost doubled by increasing the speed of the genera
. Bulletin. Science. 5W«5 Figure 68.—Gramme's 1876 type (Tatelier dynamo for use with arc lights. From Revue industrielle, February 9, 1876, p. 57. magnets grouped in the form of a triangle on each side of the armature, and each group had a common pole-piece. This machine weighed 700 kg. and measured meter square by meter high. There were 180 kg. of copper wire on the electro- magnets and 40 kg. on the armature. This large generator normally produced a light of 500 Carcel units, but it was claimed that this amount of light could be almost doubled by increasing the speed of the generator. The smaller machine weighed 183 kg. and measured meter square by meter high. There were 47 kg. of wire on both armature and field. The armature on the small arc-light machine was what Gramme termed dedouble, that is, there were two windings on the single core with a set of commutator bars on each side of the form (fig. 66).^^ These two windings could then be connected so as to double the current or to double the voltage. The in- tensity of the arc light at 900 was 200 Carcel units. Small lecture magnetos using Jamin's com- pound magnets also were produced at this time (fig. 67). Later improvements enabled Graixime to reduce the cost and increase the efficiency of his generators still. '8 Alfred N. Breguet, "Note sur la machine Gramme a I'anneau dedouble," Revue industrielle, 1876, vol. 5, pp. 106-110. Figure 69.—Gramme's 1877 type d'atelier dynamo for use with arc lights. From Revue industrielle, May 2, 1877, p. 173. 384 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. 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,
Size: 1430px × 1747px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
