TRANSACTIONS OF SROTION 0. 



271 



sti-engtheniiig' the positive phase of the oscillations, the other the negative 

 phase. This is accomplished by causing the oscillations in the inductance- 



/0\ 





f 





■i 



II 



Fig. 1. 





Fig. 2. 



capacity circuit to act upon the two grids in opposite senses. Of many possiWe 

 circuits the two shown in the accompanying figures have proved very convenient. 



4. A Trigger Relay utilising Three Electrode Thermionic Vacuum 

 Tubes. By Professor W. H. Eccles and F. W; Jordan.* 



Fig. 3. 

 •^ See The Electrician, Sept. 19, 1919, p. 298; Bndio Review, Vol. i., p. 14.3. 



