The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 121
erent sec-tions may also vary slightly in diameter, the coarser wirebeing used for the end sections and the finer for themiddle, on account of the greater potential difference atthe ends and induction at the center already mentioned. Ruhittkorffs Commutator.—The commutator inventedby Ruhmkorff is… … Fig. 44. V connected by the pins v and v respectively with the^xes a and b^ which, as well as the cheeks, are insulated ELECTRO MAGNETISM. IOC from each other by the rubber. Two brass springs con-nected with the binding-posts B and C press against thecylinder, which is mounted on brass supports…
Electricity · Magnetism
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