Harmsworth, Alfred Charles William, Sir, bart · London Bombay : Longmans, Green, and Co. · leaf 194
oe-pattern magnets supported on ametal base, on the inner faces of which are fastened two piecesof metal known as pole-pieces, provided with hollow faces,within which is fastened an H-shaped piece of soft iron(armature). The channels of this armature are filled withinsulated wire. In the space…
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