Short Notices

Abstract

THE fifty-third annual edition (1935) of the electrical trades directory and handbook will prove of value to everyone who wants to have the latest information about the activities of the electrical engineering profession and industry. In this edition more societies, associations and technical schools and colleges are included. Many physical constants connected with industry are given, and we were interested in an instructive page on telephone transmission units. The difference between the American standard line of cable and the English standard line is clearly explained and the decibel and neper are defined. Useful particulars are given about the Bureau of the International Communication Union. The grid scheme of the Central Electricity Board was completed last year, and grid tariffs for the whole of Great Britain, except south Scotland and north-east England, are in operation. In the manufacturing industry a fairly general and sustained improvement occurred during 1934. The output of electricity by supply undertakings increased 14 per cent compared with the previous year. The use of broadcasting and telephony has also greatly increased.