摘要:

During the past 40 years radical changes in manufacturing conditions have rendered industrial research essential for the attainment of reasonable efficiency and progress.Industrial research is divisible into two orders, the more general and the more particular, both being necessary for the production of a new article. The second is usually, termed “Development,” and is the special subject of this paper.While British men of science and applied science have been pre-eminent for general research, little attention has been paid to development. Hence few inventions have, within recent years, been brought to their conclusion in this country, as compared with the great amount of original scientific work which has been successfully accomplished.The reasons for this are analysed, and the cause is traced to lack of the co-operation necessitated by modern manufacture. This want is filled by development departments.The various functions of the latter are dealt with. Their outcome is the removal of all non-standard, work and technical troubles from the shops and drawing offices, and the provision of original and matured designs of new and improved articles for manufacture.The negligible value of ordinary sources of novel suggestions is discussed, and the qualifications of a development man are deduced. The question of staffing the department, and the educational qualifications which the staff should possess, are then treated.Practical matters, including buildings and equipment; procedure in development, the recording and filing of results and data, and the indexing of literature and information, are discussed.A short summary is given of the principal industrial research organizations in Great Britain, with a brief discussion on co-ordination

DOI:10.1049/jiee-1.1924.0001

出版商:IEE    

年代:1924

数据来源: IET

摘要:

The paper is an attempt to explain the phenomenon of whirling by proving that it is essentially a case of vibration, and obeys the laws of vibration, especially those relating to the phase change between the disturbing force and the resulting displacement.Whilst acknowledging that the critical speed of whirling is usually calculated by the same expressions as those which give the natural time of vibration, it is maintained that the identity of the two phenomena is not sufficiently recognized. To prove this, the case of the spring-controlled governor is cited, which, according to the ordinary treatment of whirling—equating the centrifugal and the elastic restoring forces—should come in again above a certain speed.A description is given of experimental verifications of the theories put forward.

DOI:10.1049/jiee-1.1924.0008

出版商:IEE    

年代:1924

数据来源: IET

DOI:10.1049/jiee-1.1924.0009

出版商:IEE    

年代:1924

数据来源: IET

DOI:10.1049/jiee-1.1924.0010

出版商:IEE    

年代:1924

数据来源: IET

DOI:10.1049/jiee-1.1924.0011

出版商:IEE    

年代:1924

数据来源: IET

摘要:

A mechanical model is described which represents the action of a 3-electrode valve when coupled to an oscillatory circuit. A string moving around pulleys, one of which is driven by a small motor, represents by its motion the current through the valve. The oscillatory circuit is represented by a spring and a weighted pulley. By a mechanical coupling between the spring and a brake on the driving motor the effect of the intermittent current through the valve is obtained, and the system exhibits self-maintained oscillations. A note is added on a “negative resistance” effect obtained with a centrifugal friction governor.

DOI:10.1049/jiee-1.1924.0012

出版商:IEE    

年代:1924

数据来源: IET