Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . GNETISATION. 11 the attractive forces when used separately ; because, in a barmagnet only one pole could be used at a time, while nowboth poles act together. A piece of soft iron, called the keeper, is placed across the ends of thepoles when they are not in use, to assistin preventing the loss of 16 illustrates a horseshoe magnet ofrectangular cross section with its keeperattached. Fig. 13 illustrates the propermethod of putting away two bar mag-nets with their keepers
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . GNETISATION. 11 the attractive forces when used separately ; because, in a barmagnet only one pole could be used at a time, while nowboth poles act together. A piece of soft iron, called the keeper, is placed across the ends of thepoles when they are not in use, to assistin preventing the loss of 16 illustrates a horseshoe magnet ofrectangular cross section with its keeperattached. Fig. 13 illustrates the propermethod of putting away two bar mag-nets with their keepers, to prevent loss ofmagnetism; the unlike poles are placedat the same end, with the keeper connect-ing them. A laminated, or compoundhorseshoe magnet, built up of a numberof separate horseshoes and fastened to-gether with their like poles at the same end, is depictedin Fig. 17. Laminated horseshoe magnets are used in elec-trical measuring instruments, magneto-electric generators, andin telephones. 19. Horizontal Magnetic Needle.—The magnetic needlewith its stand is shown in Fig. 18. It consists of a thin. Fig. 16.—HorseshoeMagnet and Keeper.
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