Picture Transmission by Submarine Cable

The direct transmission of pictorial matter over transatlantic submarine cable has become practical through the development of some special types of networks and amplifiers. These are required because of the rapid increase of the circuit attenuation with frequency, and in order to override certain characteristic electrical interference to which the cable is subject. A summary is presented of the fundamental theory which governs facsimile and telegraph transmission, and the methods are shown by which this is applied to meet the conditions of cable picture working.