. Bulletin. Science. the midsection of the cores was pushed aside to form a circular arch to permit the armature to be placed between them. The magnetic circuit was completed by vertical iron plates at the ends. One of the first exact measurements on the efficiency of a dynamo was made by John Hopkinson when he determined the efficiency of the Siemens generator and found it to range between 88 and 90 percent, depending on the amount of current drawn.'"'' The Siemens firm also constructed motoi's (fig. 77d, e). Higgs and Brittle, two of the men associated with William Siemens in the constr
. Bulletin. Science. the midsection of the cores was pushed aside to form a circular arch to permit the armature to be placed between them. The magnetic circuit was completed by vertical iron plates at the ends. One of the first exact measurements on the efficiency of a dynamo was made by John Hopkinson when he determined the efficiency of the Siemens generator and found it to range between 88 and 90 percent, depending on the amount of current drawn.'"'' The Siemens firm also constructed motoi's (fig. 77d, e). Higgs and Brittle, two of the men associated with William Siemens in the construction of the English. 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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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
