Volta alexandro (2 Ergebnisse)

Paris, Guillaume/Fuchs, An VI, ou 1797, AN VII (1799). Without wrappers.In: "Annales de Chimie, ou Recueil de Mémoires concernant la Chemie" Tome 23, 4. Cahier. Titlepage to vol. 23. + Tome 29, Cahier 1, Titlepage to tome 29. Stamp to verso of titlepages. Pp. (225-) 336 + pp. (1-) 112. (2 entire issues offered). Volta's letters: pp. 276-315, 1 folded engraved plate with 22 figs. + pp. 91-93. First French edition of these 3 letters to Gren in which Volta described his last steps towards his groundbreaking construction of his famous "Pile". In the letters he established the first law governing an electrical fluid and he anticipated both Davy and Faraday."In 1796 Volta wrote three letters to Gren (published in German in Gren's N.J. der Physik). In THE FIRST he describes 'a very remarkable experiment'. A tin cup filled with soapy water, milk of lime, or better fairly strong alkaline ley, was held with one or both hands moistened witn ater, and the tip of the tongue dipped into the liquid. A sour taste was at once perceived by the tongue in contact with the alkaline liquid, which soon, changed into a salty and finally into a sharp alkaline taste. The acid taste was 'produced by the current of the electric fluid passing from the tin to thee alkaline liquer, from there to the tongue, then through the body to the layer of water and from there to the tin in a continous current. In his SECOND LETTER Volta repeats this 'law' of the combination of three conductors. The mutual contact of silver and tin, for example, produces 'an action, a force, by means of which the first gives the electric fluid and the second receives it. If the circuit is completed by a humid concustor, a current or continous circulation of this fluid is set up in the direction indicated in the table (depicted on the attached plate). In his THIRD LETTER Volta describes experiments in which plates of silver and zinc so smooth that they adhered on contact, polished, dry, and insulated, were brought in close contact, and separated by pulling them perpendicularly apart. They gave small deflections when applied directly to the electrometer." (Partington "A History of Chemistry", Vol. IV, pp. 10-12).…

Halle, Rengerschen Buchhandlung, 1802-(1803). Without wrappers as published in "Annalen der Physik. Herausgegeben von Ludwig Wilhelm Gilbert", Bd. 10, Viertes Stück. (The entire issue offered (= Stück 4). Titlepage to vol. 10. Pp. 389-512 a. 1 engraved plate. + Extract from Ergänzungsheft zum Jahre 1802. (=Zweite Abhandlung). Volta's papers: pp. 421-449 a. pp. 497-520. Very light browning to 2. Abhandlung. First appearance in German of Volta's importent paper in which he describes the electrical forces that acts between the metal-plates in the Voltaic Pile. The German publication was printed in the same year as the Italian original "Sull' identita del Fluido Elettrico col Fluide Galvanico", 1802."A long memoir by Volta in two parts.reports that by measuring the electrometer deflections with different pairs of metals he found that the forces which drive the electric fluid.from the first metal to the second are: silver/copper 1, copper/iron 2, iron/thin 3, lead/tin 1, lead/zinc 5. Then the force for silver/zinc in immidiate contact is 12 (1+2+3+1+5), copper/tin 5 (= 3+2), iron/zinc 9 (5+1+3), etc. Thus 'the force or impulsion with which two metals act on the electric fluid is equal to the sum of the forces of the series of metals which stands between them, and.the electric force is the same as that which arises when the two extreme metals have no effect on the force of the latter'. This is the first statement of what Maxwell called 'Volta'slaw of contact electricity'."(Partington IV, p.15.).…