This excitation or " keep-alive " circuit was absolutely necessary for single-phase rectifiers such as the excitron and for mercury-arc rectifiers used in the high-voltage supply of radiotelegraphy transmitters, as current flow was regularly interrupted every time the Morse key was released.
12.
This was a very convenient arrangement, since the signal could be easily modulated by simply connecting a relay between the relatively low voltage alternator output and the transformer's primary winding, and activating it with the morse key . ( Lower-powered units sometimes used the morse key to directly switch the AC, but this required a heavier key making it more difficult to operate ).
13.
This was a very convenient arrangement, since the signal could be easily modulated by simply connecting a relay between the relatively low voltage alternator output and the transformer's primary winding, and activating it with the morse key . ( Lower-powered units sometimes used the morse key to directly switch the AC, but this required a heavier key making it more difficult to operate ).
14.
Beforehand, the flyers had been poorly informed about whether Nijmegen was a Dutch or a German city, whether German-occupied cities could or couldn't be bombed, and if so in what way, and they were negligent in finding out exactly which cities they were about to strike, partly due to miscommunication that can be ascribed to technical problems such as a stuck radio operator's morse key.
15.
In 1894, with the help of the Branly filings tube, Lodge gave a couple of demonstrations, one in June at the Royal Institution at Oxford and one in August at Oxford, to the British Association, using Hertz oscillators for transmitting signals, using a Morse key in connection with the sending coil, and a Thomson marine galvanometer for receiving them sending the signals from one room to another through walls, and so on.
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