This historic book may have numerous typos and missing text. Purchasers can key in a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...of generating plant and other accessories, and these have given the work which has been, and is being, done a more permanent and satisfactory character. Still, much has yet to be done; and, while the present impulse seems to proceed from a comparatively firm basis of knowledge and experience, it is to be hoped that what has still to be done will continue to proceed rather on the safe lines of steady and gradual progress, than by haphazard and speculative methods of exploitation, such as are apt to obtain under the circumstances that have been brought about by the Electric Lighting Acts, which have forced private companies and corporations into the projection of enormous schemes, such as should rather be the outcome of gradually-acquired experience than of the visions of enthusiasm, or the unnatural forcing of insufficiently developed systems. We may now take a survey of the means at present available for the production and distribution of electricity. This commodity of electric current, although strictly speaking a natural product, is not naturally produced in a form available by known means for the service of man. It is, therefore, necessary to produce it artificially by the expenditure of some form of energy. Society of actuaries. The possible methods of producing electric currents are many, but at present the cheapest and most convenient method is by the transformation of mechanical into electrical energy. Speaking broadly, the only source of mechanical power available on a large scale for this purpose at the present time is the steam engine. Volume of a prism. The utilisation of water power for electric-lighting purposes is limited by the heavy cost of acquiring rights to the source of the supply, and this first cost cannot be incurred until the demand for electricity has increased to a suffic... Society one.