DESCRIPTION OF THE ELECTRIC ACTION.
The electric action consists substantially of a small bellows like the pneumatic lever, but instead of the valve admitting the wind to operate it being moved by a tracker leading from the key, it is opened by an electro-magnet, energized by a contact in the keyboard and connected therewith by a wire which, of course, may be of any desired length. We illustrate one form of action invented and used by Hope-Jones.[5]
Within the organ, the wires from the other end of the cable are attached to small magnets specially wound so that no spark results when the electric contact at the key is broken. This magnet attracts a thin disc of iron about 1/4 inch in diameter, (held up by a high wind pressure from underneath) and draws it downward through a space of less than 1/100 of an inch.
The working is as follows: The box A is connected with the organ bellows and so (immediately the wind is put into the organ) is filled with air under pressure, which passes upwards between the poles of the magnet N. Lifting the small iron disc L it finds its way through the passage L into the small motor M, thus allowing the movable portion of the motor M to remain in its lower position, the pallet C1 being closed and the pallet C2 being open. Under these conditions, the large motor B collapses and the pull-down P (which is connected with the organ pallet) rises.
