Excerpt from Ignition Devices for Motors

By Mr. ARTHUR CROTCH, of the Engineer-in-Chief'a Department, G.P.O., London. Mr. Crotch, who it a silver medalist and honoursaman in Telegraphy, and honoursman in Telephony, City and Guilds of London Institute, in his Preface, says: -

"To describe an installation of secondary cells a great deal more is required than merely to treat of the battery itself. Given the latter, the question of charging immediately arises. If a public supply of continuous current at a low voltage be available, the cells will be charged direct If the voltage be unsuitable, a dynamo will be necessary, and a motor may be interposed to drive it Hence the student is told something of both dynamo and motor. Again, if the public supply be alternating - single or polyphase - some elementary explanation of alternators, and induction motors, and of alternating currents generally, will be welcome. Having treated of continuous current transformers, the static transformer naturally falls within the purview. Hence I traverse, broadly and simply, the whole field of generators and motors, direct and alternating current, together with the accessories involved- voltmeters, ammeters, automatic cut-outs, etc., etc. As to the accumulators themselves, I deal in a simple manner with the principles involved, and describe the main types in use in the telegraph service, including practical details of the running of charging plant, the treatment and behaviour of the cells."

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