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| Keywords: Foucault's regulator.jpg en Foucault constructed in 1858 the apparatus shown in Fig 426 taken from La Lumière Électrique The two carbons a and b are arranged horizontally fixed upon the rollers c c ² The two springs R R ² tend to move the carbons towards each other and are connected by means of a string running over the pulley P with it so that the motion can take place only when the clockwork M also moves The lever L and the string P ² P ² ² P ² ² ² are so arranged that c and c ² move at the same time only c ² having the negative carbon moves much more slowly than c The electric current before it enters the carbons has to pass the electro-magnet E To the armature A which is movable about r the rod D is fastened; and according to the position which the armature has it will liberate or stop the clockwork The spring r tends to lift the armature from the electro-magnet By means of the catch d the clockwork may be stopped by the hand The voltameter K compensates for variations in the strength of current ; increasing or diminishing the resistance by allowing the plates to take different positions in the fluid When the carbons a and b are at the right distance from each other the current will have its normal strength and the electro-magnet attracts the armature A In this position the rod D stops the clockwork and the carbons remain stationary If the distance of the carbons by means of their consumption becomes too large i e increases the resistance in the circuit the spring r overcomes the force of attraction of the magnet E and the annature A is lifted off; the rod D no longer stops the clockwork and c c ² can move towards each other until the resistance of the circuit has its original value and the arc has its normal length The current will then have its original strength and cause the electro- magnet E to attract the armature A again 1886 Fig 426 at http //www archive org/stream/electricityinse01wormgoog page/n489/mode/1up page 451 in Electricity in the service of man by Alfred Ritter von Urbanitzky edited with copious additions by Richard Wormell Published by Cassell Company 1886 Unknown illustrator PD-old-100 Arc lamps Scans from 'Electricity in the service of man' 1886 | ||||
