Something approaching the modern theory of short-wave propagation was now put forward by Appleton; Round wrote our first article on second-channel interference and other troubles to which the superheterodyne, now becoming of practical significance, is prone. Baird wrote on television by reflected light (as opposed to shadow graphs) and that versatile genius, A D Blumlein, in collaboration with N V Kipping, discussed valve theory. Electrical recording and reproduction of gramophone records was introduced and the quartz oscillator and piezoelectric effect were described.
The amateurs' position had, we considered, been steadily undermined by the Post Office and, feeling diplomatic methods would no longer suffice, we publicly offered £500 towards the cost of fighting a test case against the Postrnaster-General. It so happened the Marconi Company (then our publisher) was at the time engaged in delicate negotiations with the Post Office: an embarrassing situation seemed likely to arise, so the obvious course was to get rid of Wireless World as quickly as possible. Thus the transfer to our present publishers came about. That, needless to say, is a story which did not appear in Wireless World.