An international system of electro-therapeutics : for students, general practitioners, and specialists . e sensibility of a galvanometer may be varied in a very simplemanner by the use of such coil, which is termed a shunt.^ A shunt is aresistance coil, or coil of fine wire used to direct some definite portionof a current, taking it past a galvanometer instead of through its coils. Electricity and Magnetism. Fleeming Jenkin, , L. and E., London. For themathematical part relating to shunts, see works on physics. GALVANISM. A-229 Thus, let Gy Fig. 24, represent the shunt. Let the resista
An international system of electro-therapeutics : for students, general practitioners, and specialists . e sensibility of a galvanometer may be varied in a very simplemanner by the use of such coil, which is termed a shunt.^ A shunt is aresistance coil, or coil of fine wire used to direct some definite portionof a current, taking it past a galvanometer instead of through its coils. Electricity and Magnetism. Fleeming Jenkin, , L. and E., London. For themathematical part relating to shunts, see works on physics. GALVANISM. A-229 Thus, let Gy Fig. 24, represent the shunt. Let the resistance of theshunt be one-ninth that of the galvanometer, then of a total currentfrom G to D nine parts go through the shunt and do not deflect theneedle, while one part goes through the galvanometer; only one-tenthof the whole current is, therefore, eflTective in deflecting the needle, andthe deflection, supposing a mirror galvanometer be used, is only one-tenthof what it would have been had no shunt been used. Similarly, bj^ makingthe shunt equal in resistance to one-ninety-ninth of the galvanometric. Fig. 24. coil, we reduce thesensibility of the instrument to the one-one-hundredthpart of its original sensibilitj^ All instruments used by electro-therapists are invariabl}^ cali-brated and marked, as aforesaid, to read in millianiperes, by all theirmanufacturers. These milliamperemeters are made up into two differentstjles, as the vertical and horizontal. Fig. 25 is a horizontal onedesigned for phjsicians; it is direct reading, and thus a means ofobtaining quick, accurate, and reliable electrical measurements, such as A-230 BLEYER. have hitherto been unattainable. No time is required for adjusting orwaiting for the needle to come to rest, but readings can be taken imme-diately as soon as the circuit is closed. This instrument is accurately
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
