. The New England magazine . nsufificiencies which have resulted in thegradual displacement of the needle by theelectro-magnet for signalling was still lacking, as we shall see,the one feature which makes the electro-magnet, as Vail left it, one of the happiestof modern inventions, fitting it to be thehand of the far writer, the tongue ofthe far speaker, the member which trans-lates volition into mechanical movementa hundred miles away, betrays the guiltystep of the burglar without his knowledge,and utters the note of warning when aswitch is misplaced or a dam threatens togive w
. The New England magazine . nsufificiencies which have resulted in thegradual displacement of the needle by theelectro-magnet for signalling was still lacking, as we shall see,the one feature which makes the electro-magnet, as Vail left it, one of the happiestof modern inventions, fitting it to be thehand of the far writer, the tongue ofthe far speaker, the member which trans-lates volition into mechanical movementa hundred miles away, betrays the guiltystep of the burglar without his knowledge,and utters the note of warning when aswitch is misplaced or a dam threatens togive way. \ 50^*5 Fortunately, Professor Henrys servicesto the telegraph rest on a surer basisthan the Albany trial system , who knew nothing of any otherelectro-magnet but that of Sturgeon, wasbrought to a desperate standstill in hissearch for the electric telegraph, bylearning that he could produce electro-magnetic effects only through a shortlength of wire. It was through ProfessorGales making him acquainted with the.
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