摘要:

The paper deals with the progress made since a previous one on the same subject. It is also a sequel to the report of the I.E.E. Committee on Electricity in Agriculture.The field covered by electro-farming is now so wide that the paper has been confined to the latest developments and the chief points about which information is at present required. These are classified under three headings:—“The Rural Distribution System” draws attention to the importance of dealing with statistics on the basis of the route miles and not the area supplied. It is claimed that where a quarter of the area is arable land, the supply is profitable.“The Farm Installation and its Uses” deals with the practical points which arise in planning a farm installation, including the special requirements of electric motors for farms. Reference is made to new methods of speed reduction and to a plan for improving the load factor by restrictive control of the larger apparatus. The latest developments are discussed, such as intensive illumination for stimulating plant growth, and the possibilities ofincreasing the yield of honey.The last heading covers some of the aspects of “Work on the Land, and Haulage”. The most important feature is electric ploughing, which ensures a profitable load for the supply undertaking. A specification is given of the author's ideal of an electric tractor suitable for the smaller farm. It is designed for ploughing as well as all other field operations and general haulage, and is fitted with a half creeper track and also a storage battery. The object of the latter is to enable the tractor to proceed from field to field and also to haul loads on the public roads. When carrying out field work it is intended that the machine should take its supply from overhead lines by means of a cable laid on the ground. Mention is made of a method for reducing plough friction by making the plough coulter alive. Other matters dealt with are: rotary tillers, progress in making hay without sunshine, new developments in electro-silage, and a central method for liquid-manure distribution over farm lands. In an Appendix, a bibliography of the more important references to the subject is provided.Generally, the paper sums up the results of a great deal of full-scale experimental work carried out by the author.

DOI:10.1049/jiee-1.1926.0078

出版商:IEE    

年代:1926

数据来源: IET

摘要:

The paper describes experiments which have been carried out with a view to obtaining more conclusive evidence as to the causes of the apparent variations in bearings observed under certain conditions on wireless direction-finders. In the course of the experiments the Adcock “four-aerial” direction-finder has been developed, and with its aid it has been shown that the actual deviation in azimuth of wireless waves is practically negligible. These experiments thus constitute a proof that the variable errors observed on closed-coil direction-finders at night are caused by downcoming waves arriving from the upper atmosphere and polarized with the electric force in a horizontal plane. The investigation also indicates the possibility of the Adcock system being developed into a practical direction-finder which is free from night errors, and those errors associated with observations on aircraft transmissions made at a, ground direction-finding station.

DOI:10.1049/jiee-1.1926.0084

出版商:IEE    

年代:1926

数据来源: IET

摘要:

Lamps are first compared with other electrical apparatus as regards the possibility and the method of economic choice. Choice of type (carbon, metallic vacuum and gas-filled) is first considered, and then choice of rating for a given type, the latter being treated both graphically and algebraically. Simple formulæ are developed for the most economical rating, first with a fixed lamp and then with a fixed candle-power. These are applied to a number of different cases, and various courses of action are suggested for the manufacturer and the lamp user.

DOI:10.1049/jiee-1.1926.0086

出版商:IEE    

年代:1926

数据来源: IET

摘要:

This paper is concerned with the interference between circuits in homogeneous cables, and its reduction. The line is replaced by its equivalent network, and, in the case of a four-wire group as used in superimposed circuits, the network consists of six members. The relations between the induced and inducing currents and voltages are established, and a quantitative definition of interference is given. The effects of unbalances in the line constants are discussed, and the influence of distance and frequency is investigated. An account is given of methods of measurement and of the means of reducing interference in cables, and a method developed by the author for dealing with the difficulties introduced by the distributed inductance in continuous loading is described.

DOI:10.1049/jiee-1.1926.0087

出版商:IEE    

年代:1926

数据来源: IET

DOI:10.1049/jiee-1.1926.0093

出版商:IEE    

年代:1926

数据来源: IET