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Vorläufige Anzeige des Gesetzes, nach welchem Metalle die Contaktelektricität leiten" in Jahrbuch für Chemie und Physik 14, 1825, pp. 110-118 WITH "Bestimmung des Gesetzes, nach welchem Metalle die Contaktelektricität leiten, nebst einem Entwurfe zu einer Theorie des Voltaischen Apparates und des Schweiggerschen Multiplicators" in Jahrbuch für Chemie und Physik 16, 1826, pp. 137-166 FIRST EDITIONS (2 Volume) OF GEORG OHM'S FIRST & SECOND PAPERS, HERE BEGINNING A SERIES "of experiments documenting the voltage across and the current through simple electrical circuits containing various lengths of wire" (History of Science: The Wenner Collection). These papers lead directly to his seminal 1927 formulation theory of galvanic electricity, or Ohm's Law. Note that the first paper, Vorläufige, (V. 14) was published first in Schweigger's Journal fur Chemie und Physik while the second paper, also in Schweigger's (V. 16), was published simultaneously in Annalen der Physik as well - meaning that neither scholars nor collectors consider the Schweigger appearance of the second paper, Bestimmung, or the Annalen appearance of more import or worth than the other. " In the field of electrical measurement, Ohm was the great pioneer" ( PMM, 174). He began publishing his electricity researches in 1825 with the first paper: "Vorlaufige Anzeige des Gesetzes" offered here. In it, he "sought to find a functional relationship between the decrease in the electromagnetic force exerted by a current-carrying wire and the length of the wire. Although this paper contained some fundamental errors, it was remarkable for its direct foundation on experiment - the paper deduced clear mathematical relationships based purely on the experimental evidence that Ohm had tabulated; this would grow to be a defining characteristic of all Ohm's early papers (Jeremy Norman). In the second paper offered , Ohm presented the experimental proof of his law, "the fundamental law of electric circuits" (Dibner 63). "Ohm's experimental procedure in ["Bestimmung des Gesetzes"] was analogous to that which he had used earlier but was modified in several significant waysâ€¦ He now used a thermoelectric pile in order to eliminate the fluctuations in current strength accompanying the voltaic pile, fluctuations that Ohm attributed to changes produced by the current in the distribution of the components in the liquid conductor. "Second, he sought a direct relationship between the electromagnetic force of the current and the entire length of the connecting wire. . . . [in] the paper in question Ohm simply observed that the data from each of his several sets of experiments were very closely represented by the formula X = a/(b + x), where X is the strength of the electromagnetic effect-which he took as a measure of the electric current-of a conductor of length x on the magnetic needle of a Coulomb torsion balance, and where a and b are constants the exact nature of which he proposed to determine from additional series of carefully controlled experiments. The observation that b remained constant for all series of experiments, whereas a varied with temperature, led Ohm to conclude that a depended solely on the electromotive force of the pile and b solely on the resistance of the remaining portion of the circuit, in particular that of the pile itself. He also observed that the electromotive force of the thermoelectric pile appeared to be exactly proportional to the temperature difference at its end points. . . . " "After reconfirming the validity of his law by a further series of experiments, Ohm exhibited its explanatory powers on some of the chief unsolved problems which had occupied scientists working on the pile; and he showed how it also cast light on a number of other previously reported but poorly understood experimental findings. . . . The fruitful application of Ohm's simple law to existing problems was an explanatory tour de force" (DSB, Vol. 10). CONDITION & DETAILS: 2 volumes. Halle: Journal für Chemie und Physik. 8vo. Volume 14: [2], 14, [496], 3, [2]. 3 plates. Volume 16: [2], 16, [496], 4, [2]. 3 large fold-out plates. Small stamp on title pages. Beautifully rebound in period goatskin over marbled paper; 5 raised bands at the spine with gilt-tooling and -lettering in the compartments. New endpapers. Minor toning within. Near fine condition. [Bookseller: Atticus Rare Books]
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