Organ, the, 294, _300_; bellows, 303; console, 305; echo, solo, swell, great, and choir, 301; electric.
_133_; needle, _128_; recording, 133; sounder, 132. Telegraphy, high-speed, 135; wireless, 137. Telephone, 147; Bell, _148_; circuit, double-line, 155; circuit, general arrangement, _152_, 153; exchange, _154_, 155.