An international system of electro-therapeutics : for students, general practitioners, and specialists . g over the surface a carpenters lead-pencil,or, in fact, an ordinary pencil; but the former having a larger surface oflead, the coating can be renewed more rapidly. It is possible with tliisrheostat to gradually remove the entire resistance by moving the brushup over the surface which has been covered with graph^.e, or, at least,the remaining resistance is so little as to be inappreciable. The advantages of this rheostat are that it is flat, it occupies a verylittle space, it cannot be upse
An international system of electro-therapeutics : for students, general practitioners, and specialists . g over the surface a carpenters lead-pencil,or, in fact, an ordinary pencil; but the former having a larger surface oflead, the coating can be renewed more rapidly. It is possible with tliisrheostat to gradually remove the entire resistance by moving the brushup over the surface which has been covered with graph^.e, or, at least,the remaining resistance is so little as to be inappreciable. The advantages of this rheostat are that it is flat, it occupies a verylittle space, it cannot be upset, and the connections are practically inde-structible. It can be readily removed from the cabinet or table andtransported for use elsewhere, though its size (the diameter being aboutseven or eight inches) makes it rather an awkward instrument for carry*ing conveniently in a bag. GALVANISM. A-239 Dr. A. H, Goelet, recognizing the fact that a smaller rheostat wasneeded for use with a portable battery at a patients house,—one smallenough to make a convenient package and readily carried in the pocket. Fig. 35.—Goblets Slate Pocket-Rheostat fob Galvanic Cukrent. from place to place,—was led to suggest the modification of this rheostatshown in the cut (Fig. 35), which is made for him by the Waite &Bartlett Manufacturing Company. It is a small disc of slate, onlythree inches in diameter, marbleized on the upper face and around the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
