Abstract :
The reasons for the introduction of coupled-circuit working are set forth, with some account of the preliminary experiments at Stonehaven and Northolt. The action of the coupled circuit in reducing harmonics and ¿mush¿ is explained. Details of the design of the various portions of the circuit are given, together with an explanation of the tuning properties of the circuit. The coupled circuit is found to give very constant frequency, and the factors contributing to this are dealt with in detail. The reduction of harmonics and mush by the coupled circuit is very large, but the steps taken to reduce the residuum to still smaller proportions are described.
