摘要:

This scheme, now in its third year of operation, is designed to bring to Great Britain every year thirty-eight Canadian graduates in engineering for post-graduate studies.The Fellowships have a duration of two years and are tenable in industry, in universities, or partly in each of these.The author has been connected with the scheme from its inception; he assists in the selection of the graduates in Canada and arranges for their location and training in the United Kingdom. The paper describes in some detail the origin, purpose and operation of the scheme and raises many issues of interest and importance.The author also gives summaries of the reactions of Athlone Fellows who are now receiving post-graduate training in Great Britain. The purpose of the paper is twofold: to give information concerning a new and important system of Fellowships, and to evoke constructive criticism from professional engineers of its objects and operation.

DOI:10.1049/pi-1.1953.0052

出版商:IEE    

年代:1953

数据来源: IET

摘要:

The paper describes some of the design features of five out of a number of power stations designed and mainly constructed before the Electricity Act of 1947, which established the British Electricity Authority.The stations described were built for different supply undertakings under arrangements with the Central Electricity Board. Some were connected direct to the Grid system and others were to supply a local load in addition to exporting energy to the Grid, with wide variations in the load curves. It therefore appeared to the authors that the technical features of such stations, designed as they were for a variety of operating conditions, would be of interest. Since 1948 the British Electricity Authority has been able to locate and build stations to suit wider national requirements, and has been able to accelerate the trend to large units and to institute a measure of standardization. In view of this tendency to standardization it should be noted that all the stations discussed embody many features, not all of which are fully resolved in the minds of designers; on these features the authors would like to submit their views. They claim that the general principles of design of the stations are fundamentally correct, as representing the general good practice of the time, or as valid for the particular circumstances.The five stations described in the paper were commissioned between 1942 and 1951, one (Earley) being a war-emergency station. They have been chosen to display variety in size and number of units and in steam conditions. Reliability was a first consideration, with true overall economy (as opposed to highest possible thermal efficiency) coming second. For this reason simplicity was preferred to any complication which might offer problematical improvement in efficiency. Nevertheless, four of the stations have appeared among the ten most efficient B.E.A. stations in successive years, and one (Littlebrook “B”) has shown the highest efficiency in the country.

DOI:10.1049/pi-1.1953.0053

出版商:IEE    

年代:1953

数据来源: IET

DOI:10.1049/pi-1.1953.0056

出版商:IEE    

年代:1953

数据来源: IET

摘要:

It has been found necessary to develop a machine for the study of traffic problems in telephone exchanges. The machine consists essentially of two parts, one to simulate the random occurrence and release of calls, and the other to provide the analogue of the trunking system it is required to examine.A design employing electronic techniques and in which the random feature is obtained from the noise voltages developed by cold-cathode gas-discharge tubes is described. The theory of the machine is discussed and possible future applications of its basic principles are outlined.Some results are given of tests made over the last four years by traffic analyser built in accordance with the principles described. Tests of standard gradings confirm the earlier theoretical work O'Dell.1The traffic analyser has proved extremely reliable in service.

DOI:10.1049/pi-1.1953.0057

出版商:IEE    

年代:1953

数据来源: IET

摘要:

The paper describes a method whereby the fundamental and third-harmonic quantities in the steady-state solution of a network containing certain non-linear elements may be obtained approximately.The method consists of three stages:(a) A first approximation to the fundamental-frequency solution, usually accurate to within 10%.(b) A third-harmonic solution (generally within 15%) using an equivalent circuit which is dependent on the first fundamental solution.(c) A correction to the fundamental solution, using third-harmonic quantities, which brings its accuracy to within about 3%.Adaptations of some standard techniques of solving linear steady-state problems for use with this method of analysis are described.

DOI:10.1049/pi-1.1953.0060

出版商:IEE    

年代:1953

数据来源: IET

摘要:

The three main methods of producing special effects which are now coming into use in television are described. They are: (a) back projection, in which additional scenery is placed behind the actors in the form of a translucent screen on to which is projected an optical image of the required background; (b) inlay, in which by electronic means the picture from one television camera is replaced over a chosen fixed area by the picture from another camera; (c) overlay, in which the result is similar to back projection but the image of the additional scenery is added electronically.Some indication is given of the saving in production cost and the widening of programme scope resulting from the introduction of these processes to the television service, and the operational difficulties introduced are considered.

DOI:10.1049/pi-1.1953.0061

出版商:IEE    

年代:1953

数据来源: IET

DOI:10.1049/pi-1.1953.0064

出版商:IEE    

年代:1953

数据来源: IET