by Mr. Joseph composed of a series of coils without iron cores, arranged and Colson, of Brentwood, N.Y. The object of this invention adapted to be moved in a magnetic field consisting of aseries is to utilize to the best advantage the heat of poles of alternately opposite polarity developed by the… … \ \ ed by top and bottom tubes. coils, These commutator plates are usu- Mr. Fredrick E. McKinley, of Welling- ally disposed spiral)v about the axis of the ton, Kan., has patented an improved arbor of the machine so as to show at |Hefner-Alteneck in respect to the proportion of armature school desk…
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