On Animal Electricity, an Abstract [By J. Muller] of the Discoveries of E. Du Bois-Reymond, Ed. by H.B. Jones

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. On Du Bois-reymond's Improved Galvanometer. The substance of du Bois-Reymond's most important remarks upon the construction and use of a galvanometer fit for experiments on animal electricity, may be shortly stated thus. First the copper wire of the galvanometer may be a very long and thin one, without impairing the intensity of the currents, because the resistance to conduction in all parts of animal bodies is very considerable. Du Bois-Reymond has, therefore, in making his galvanometer, far exceeded the number of coils generally employed up to his time by Gourjon, Ruhmkorff, and others, and he has succeeded accordingly in giving to his instruments a sensitiveness far beyond what had previously appeared attainable. In du Bois-Reymond's work, two galvanometers are described, of different sizes anddegrees of sensitiveness. The smaller, which was first made, he calls the galvanometer for the muscular current, because with it all the phenomena of the muscular current can be exhibited. The nervous current, also, and most of its phenomena were discovered with the same instrument . Its wire is about 3280 feet long, and -0067 inch in diameter, and is coiled 4650 times round the frame. In order, however, to observe certain most delicate variations of the nervous current, the presence of which he had anticipated theoretically, without being able to detect them by the galvanometer for the muscular current, du Bois-Reymond afterwards constructed a new and more powerful apparatus, which he called the galvanometer for the nervous current. This latter instrument is much more elaborate than the former one. Moreover, it is easy, by diverting a part of the current, to adapt its sensitiveness to the greater intensity of the muscular current. It will, therefore, only be nece...

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