The Practical Applications of Electricity: A Series of Lectures Delivered at the Institution of Civil Engineers, Session 1882-83The Institution, 1884 - 181 páginas |
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The Practical Applications of Electricity: A Series of Lectures Delivered at ... Frederick Joseph Bramwell,Institution of Civil Engineers (Great Br No hay ninguna vista previa disponible - 2016 |
Términos y frases comunes
absolute system alternate current alternate-current Ampères apparatus application of electricity armature arrangements Bell British Association unit cable carbon cent centimetre charges circuit coil conducting power conductor connected considerable conveyed copper wire current of electricity current passing diagram direction disk distance dynamo dynamo-electric dynamo-machine Edison effect efficiency electric current electric machine electrical energy electrical resistance electro-magnetic electromotive force employed engine experiments exploding agent firing Frederick Bramwell frictional frictional electric galvanometer give gunpowder gutta-percha heat high-tension fuze ignition incandescent increase instrument insulated iron JAMES BRUNLEES lamp lecture length Leyden jar light line wire Lord Rayleigh magnetic field magneto-electric matter mean solar second mechanical ments metal motion needle obtained operations plate platinum poles potential practical produced purposes receiver reckoning resistance result round Siemens unit simple simultaneous sound station submarine mines success telegraph telephone temperature tion torpedoes transmitter universal-gravitation vary velocity vibrations volts Watts wire Woolwich zinc
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Página 149 - In physical science a first essential step in the direction of learning any subject is to find principles of numerical reckoning and methods for practically measuring some quality connected with it. I often say that when you can measure what you are speaking about and express it in numbers, you know something about it ; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...
Página 151 - There cannot be a greater mistake, than that of looking superciliously upon practical applications of science.
Página 152 - ... made through the desire of discovering the solution of problems which were of a highly practical kind in mathematical science, so in physical science many of the greatest advances that have been made, from the beginning of the world to the present time, have been made in the earnest desire to turn the knowledge of the properties of matter to some purpose useful to mankind.
Página 153 - This committee worked for nearly another ten years through the whole field of electro-magnetic and electro-static measurement, but chiefly on standards of electric resistance, until in its final report, presented to the Exeter meeting in August, 1869, it fairly launched the absolute system for general use...
Página 151 - It seems, indeed, as if the commercial requirements of the application of electricity to lighting, and other uses of every-day life, were destined to cause an advance of the practical science of electric measurement, not less important and valuable in the higher region of scientific investigation, than that which, from twenty to thirty years ago, was brought about by the practical requirements of submarine telegraphy.
Página 160 - Now if I were to say that the weight of that piece of chalk is the fourth power of twenty miles an hour, I should be considered fit, not for this place, but for a place where people who have lost their senses are taken care of. I suppose almost...
Página 131 - ... to one extremity, the other being buried. About eleven months afterwards the fuze was exploded by a charge induced in the conductor during a very heavy thunderstorm. In consequence of such difficulties as these experienced in the special application of the high-tension fuzes to submarine purposes, the production of comparatively sensitive low-tension fuzes, of much greater uniformity of resistance than those employed in former years, was made the subject of an elaborate experimental investigation...
Página 5 - ... individualism and the highest success in teaching in the lower grades, a larger proportionate teaching force is imperative, the need of improvement in the quality of the work is quite as urgent. No class in the community know so well as the superintendents, whom I have the honor to address, that during the last few years very great improvements have been made in the work of the elementary schools — improvements which many of those whose work is mainly in the higher grades fail to realize or...
Página 71 - Time will probably reveal to us effectual means of carrying power to great distances, but I cannot refrain from alluding to one which is in my opinion, worthy of consideration, namely, the electrical conductor. Suppose water power to be employed to give motion to a...
Página 137 - The subject of the utilisation of electricity for purposes of defence did not, however, receive serious consideration in England or other countries until some years afterwards, when the great importance of submarine mines as engines of war was demonstrated by the number of ships destroyed and injured during the war in America. Twenty-five vessels belonging to the Federal navy were destroyed and nine others injured by the explosion of torpedoes, while the Confederates lost three vessels by accidentally...