A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . Fig. 6Another Type of Rheostat trifling expense an apparatus suitable for office-work. Forinstance, a battery may be made of cells made from ordinarytin cans, iron filings, a few porous cups, and carbon points. 10 ELECTRICITY IN DISEASES OF §18 Such a cell is shown in Fig. 8. A home-made rheostatconsists of a U-shaped tube of glass and a wire plunger andspring, as shown in Fig. 9. We have used such apparatus andfound it verv nfi nt MilliammeU i

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