A manual of practical medical electricity : the Röntgen rays and Finsen light (1902)
Turner, Dawson · New York : William Wood & Company · leaf 121
te. The plug rheostat or resistance box(Figs. 53 and 54) contains a number of coils of Germansilver wire ; each coil is wound with such an amount ofinsulated wire as to present a definite resistance, the twoends of the wire being connected severally to small brasspieces, which are securely fastened… … 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
