The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 33
being closer,and the lines of force clusteredtogether between them. Theyexert about three or four timesthe attractive power on a pieceof soft iron near their polesthat a bar magnet of the samesize would exert. Fig. 5 showsthe lines obtained when the cardon which the filings are spreadis laid on the… … lg- INTRODUCTORY ii generally made up of several thin plates, producing what iscalled a compound or laminated magnet. The plates areusually bound together by pieces of soft iron, which form thepole-pieces. Some compound magnets have been made whichwould carry a load equal to twenty-five times their…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
