A new portable telegraph transmission measuring set

THE provision of good telegraph service requires that the circuits be designed, engineered, and maintained so as to afford good transmission quality. The measurement of a single quantity, known as telegraph distortion,1 at the receiving end is sufficient to establish the transmission quality since it contains all signal degrading effects, such as interference, poor relay performance, and wave-shape distortion. Therefore, the ability to measure distortion conveniently and accurately is of prime importance.