A signal is sent by depressing the key K, and so changing the contact from a to b, and thus putting the battery r -- to line.
The French struggled gallantly to the close: but now a long succession of their leaders - Junot, Soult, Victor, Massena, Marmont, Joseph - had been in turn forced to recoil before 'Wellington; and while their troops fought henceforward under the depressing memory of many defeats, the Allies did so under the inspiriting influence of great successes, and with that absolute confidence in their chief which doubled their fighting power.
The French Revolution and the insecurity of the political situation, however, exercised a depressing and retarding effect.
The effect produced by a current is exactly opposite to that of tension, raising the elongation curve instead of depressing it.
These arms. are then altered until on raising or depressing the battery key there is no sudden deflection either way of the galvano meter.