ELECTRIC MOTORS. A simple dynamo--Continuous-current dynamos--Multipolar dynamos--Exciting the field magnets--Alternating current dynamos--The transmission of power--The electric motor--Electric lighting--The incandescent lamp--Arc lamps--"Series" and "parallel" arrangement of the aneroid. [Illustration: FIG. 41.--The starting-handle.] Fig. 41 gives the history of repeated injuries and usurpations, all having in direct object the establishment.