The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 226
two magnets,A A and B B^ may be placed with theirarmatures, M and iV, at right angles andboth normally pulled away from the poles.When the armature M is attracted a catchon its end is retained by a hole in the ^. ^. , ^ end of the other armature N, and when ^^- ILectrT-mag^et^the latter armature N…
Electricity
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