A manual of practical medical electricity : the Röntgen rays and Finsen light . Fig. 53.—Diagram of Plug Rheostat. wide range of resistance. These are expensive, but veryaccurate, instruments. In another and much simpler form for use with cautery. Fig. 54.—Plug Rheostat. batteries, where the resistance to be introduced must bevery low (up to one ohm), a single coil of uninsulated thickGerman silver wire is wound, with each turn a little dis-tance from the previous one, upon a suitable semi-cvlin- Accessories 99 drical piece of wood, and over which a sliding collector canbe- moved, making conta
A manual of practical medical electricity : the Röntgen rays and Finsen light . Fig. 53.—Diagram of Plug Rheostat. wide range of resistance. These are expensive, but veryaccurate, instruments. In another and much simpler form for use with cautery. Fig. 54.—Plug Rheostat. batteries, where the resistance to be introduced must bevery low (up to one ohm), a single coil of uninsulated thickGerman silver wire is wound, with each turn a little dis-tance from the previous one, upon a suitable semi-cvlin- Accessories 99 drical piece of wood, and over which a sliding collector canbe- moved, making contact with the wire by a spring on itsunder surface, so as to include any desired length of it inthe circuit. The wire must be thick to avoid 55 represents a rheostat with a double coil of wire, anda resistance of from o to 10 ohms in 120 subdivisions. In the graphite rheostat, a variable length of a very thinlayer of this substance can be brought into the Gaertner makes use of a number of discs of a porousmaterial, which are impregnated at a red heat with finelydivided carbon, the respective resistance of the discsdepending upon the degree of saturation with the discs are separated by plates of brass
Size: 1957px × 1277px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1902
