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Macchina Magnetica ad Elettro-Calamita Trasversale di Antonio Pacinotti nel 1860 [so titled on upper wrapper].
FIRST SEPARATE EDITION. Pacinotti's dynamo, considered to be the first practical electric motor and generator from which all modern machines emanate, was the first machine that could produce an even current of electricity, and despite continuous refinement, his basic concept remains at the heart of all modern generators and electric motors.Pacinotti's "reputation was due largely to his invention of a new form of armature used in electric motors and generators. The armature design that Pacinotti first described in a paper published in Nuovo cimento (June 1864) became a key element in the evolution from the magnetoelectric generator to the commercial self-excited dynamo during the next decade. The Pacinotti armature consisted of an iron ring with projecting teeth interspersed with coils which formed a closed series circuit with connections to a commutator. In his paper Pacinotti pointed out that his new machine could be used as either a direct-current motor or a generator" (DSB)."It is the principle of convertability which makes the electric transmission of power possible The application of this law to magneto-electric machines also was first recognised by Pacinotti and was considered by the late James Clerk Maxwell the most important discovery of the age" (A. von Urbanitsky, Electricity in the service of man, p. 616).This pamphlet, with the drophead title "Descrizione di una maccinetta elettro-magnetica. (Estratto dal Nuovo Cimento Fascicolo per Giugno 1864, pubblicato il 3 Maggio 1865)" differs from the periodical publication (vol. 19, pp. 378-384), but both are clearly from the same setting of type.No other copy of this extremely rare separate issue has been traced. Ekelöf catalogue 1277 (1912 edition). Wheeler Gift 1601 (journal issue).8vo, 7 pages, 1 lithographed plate. Original yellow printed wrappers. PRESENTATION COPY, inscribed on the upper wrapper "Al Sig. G. Ferraris, Antonio Pacinotti". Galileo Ferraris (1847-1897) was Pacinotti's colleague and an electrical engineer, notable for his transmission of electric energy over long distances, his invention of the AC induction motor, etc.
      [Bookseller: Nigel Phillips]
Last Found On: 2015-12-15           Check availability:      Direct From Bookseller    


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