In many cases it is possible to prevent much of the interference by measures taken at the listeners premises, but a large number of cases remain where the interference must be treated at the source. Very few countries have legislation requiring electrical apparatus to be rendered interference free. In Great Britain much has been done by ce-operative action between the various authorities, and the British Post Office em-that can be carried out at the listeners premises.
The lecturer went on to describe in detail the various ways in which interference from electrical apparatus could be suppressed, and showed that, in the majority of cases, the treatment required was both simple and inexpensive. It was pointed out that to avoid interference as far as possible at the listeners premises, an efficient aerial system, preferably of the "anti-noise" type, was essential. Unfortunately, this requirement is very difficult to obtain in apartment buildings.
The lecturer concluded by suggesting that something might be done in cases of known and located interference to rally public opinion through the Press, and otherwise to bring pressure to bear on the owner of the offending apparatus.
Compania San Marine, some of whom
Text read from the printed page and cleaned; old type leaves the occasional error.