. Bulletin. Science. Figure 74.—The Siemens and Halske alternator with external exciter, as shown in Vienna Exhibition of 1873. From A. Thomalen, "Zur Geschichte der Dynamomaschine," Beitrdge Geschichte der Technik und Industrie, 1916, vol. 7, p. 149. Figure 75.—The Siemens and Halske dynamo of 1876. Fronn J. Dredge, Electric Illumina- tion. London, (about 1882), vol. i, p. 280. Table 4.—Shoolbred's comparison of three models of the Siemens machine and three models of the Gramme type d'atelier, 1878. Machine and modei Candles Hp. to drive Candles! Hp. Weight Cost{£)
. Bulletin. Science. Figure 74.—The Siemens and Halske alternator with external exciter, as shown in Vienna Exhibition of 1873. From A. Thomalen, "Zur Geschichte der Dynamomaschine," Beitrdge Geschichte der Technik und Industrie, 1916, vol. 7, p. 149. Figure 75.—The Siemens and Halske dynamo of 1876. Fronn J. Dredge, Electric Illumina- tion. London, (about 1882), vol. i, p. 280. Table 4.—Shoolbred's comparison of three models of the Siemens machine and three models of the Gramme type d'atelier, 1878. Machine and modei Candles Hp. to drive Candles! Hp. Weight Cost{£) Siemens, Model A 850 1200 2 600 250 70 Siemens, Model B 650 6000 4 1500 375 112 Siemens, Model C 360 14000 8 1750 1150 250 Gramme, Model M 1600 2000 1333 150 70 Gramme, Model A 900 6000 2400 375 100 Gramme, Model C 700 15000 5 3000 800 300 Table ^.—Evaluation of the Siemens and Gramme dynamos at Chatham, England, in iSyg. Machine and model Candles Hp. to drive CandleslHp. Cost Efficiency (£) (%) Siemens, Model B, two 680 19140 1430 244 73 Gramme, Model A, two 875 18300 1920 160 88 Gramme, Model C 1200 19500 2050 240 85 Gramme, Model D 500 27500 15. 1 1820 360 89 Gramme, Model D 475 22500 12:7 1770 360 88 PAPER 30: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: III 391. 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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