File:Brooklyn medical journal. (1892) (14760946456).jpg

Identifier: brooklynmedicalj6189medi (find matches)
Title: Brooklyn medical journal.
Year: 1892 (1890s)
Authors: Medical Society of the County of Kings (Kings County, N.Y.)
Subjects: Medicine Surgery Medicine
Publisher: Brooklyn, N.Y. : Medical Society of Co. of Kings
Contributing Library: Columbia University Libraries
Digitizing Sponsor: National Endowment for the Humanities (NEH)

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re not observed. A safe charging rate is threeamperes for every square foot of anode surface in the batteryplates. A more convenient rule, however, is about one ampere forevery twenty ampere-hours of battery capacity. For the usualmedical battery a half ampere current answers sufficiently well. Asimple and economical method of charging is shown in Fig. 7. Thebattery is connected by a loop with a single 16 c.p. lamp circuit,which is used for ordinary illumination. When the lamp is turned THE APPLICATIOX OF THE ELECTRIC LIGHT CURRENT. 449 on the battery is being charged. Frequent charging and the main-tenance of a full charge are thus secured without special attention. A search-lamp may be operated by the storage battery or by con-necting it with the terminals of the cautery plant represented in theright-hand section of Fig. 8. The current required by the minia-ture lamps usually employed for this purpose is about two or two-and-a-half amperes. Turning on two of the 50 c.p. lamps in the
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Fig. 10. bank the current may then be turned up by the regulator till thesearch-lamp burns to full incandescence. Rheostats or current regulators. After careful comparison of anumber of rheostats, I have found nothing better for use with theEdison current than the Bailey water rheostat. In the old instru-ment, however, the aluminum wire should be replaced with plati-num to prevent corrosion at the contacts. The new Bailey regulator(see Fig. 9), made by the Law Battery Co., of New York, is in manyrespects an improvement on the old one. A good dry rheostat for 450 CHARLES JEWETT, A.M., M.D. the purpose is the Willms. The Vetter regulator is suitable for useonly with currents of half an ampere or less. Where currents oflarge volume are required, as for charging storage batteries, asingle lamp of large capacity may be used. A still more con-venient regulator for large currents is a bank of lamps arranged inparallel multiple-arc, as shown in Fig. 8. Milammeters. The milammeters sold by mos

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