. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. ELECTRIC TRUNK-LINE OPERATION SPRAGUE. 137 Generally speaking, it will be noted that, starting at 500 revolu- tions for a 39-minute run, the capacity of the direct-current motor averages approximately nearly double that of the alternating cur- rent throughout the thermal range; the speed of the alternating-. FlG. 1. current motor rises at a much more rapid rate, until on a 5-hour run it is double that of the direct-current motor, despite th
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. ELECTRIC TRUNK-LINE OPERATION SPRAGUE. 137 Generally speaking, it will be noted that, starting at 500 revolu- tions for a 39-minute run, the capacity of the direct-current motor averages approximately nearly double that of the alternating cur- rent throughout the thermal range; the speed of the alternating-. FlG. 1. current motor rises at a much more rapid rate, until on a 5-hour run it is double that of the direct-current motor, despite the fact that it is only developing one-half the power; the direct-current motor has a 5-hour capacity in excess of the 1-hour capacity of the alter- nating-current motor; and the ratio of the weight coefficients, begin-. 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. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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