Journal of the Franklin InstitutePergamon Press, 1886 |
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ammonia ampères anthracene apparatus armature automatic battery Bell benzene blast block boiler break carbon carbonic acid cause cent circuit closed coal coil coke committee condensation connected cylinder danger diameter diaphragm distillation dynamo efficiency electric circuit electric current electro-magnet electro-motive force engine exhibited experiments feet flax FRANKLIN INSTITUTE furnace Geissler tubes heat horse-power incandescent lamps inches indicator insulated interlocking invention iron lever light locomotive machine magnet means mechanical miles minute motor naphthalene obtained ohms operation ordinary passing patent Philadelphia pipe placed plate position pounds Presented pressure produced Prof rail railroad railway receiver Reis transmitter Reis's relay resistance revolutions per minute safety sewer shown shows sound speed steam switches and signals telegraph temperature thermometers tion tornado torpedo track instrument train transmit speech tricity truck tubes tuyeres undulatory valve varying vibrations volts weight wheels wire
Popular passages
Page 124 - 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...
Page 359 - Congress shall have the power .... to promote the progress of science, and the useful arts, by securing for limited times to authors and inventors, the exclusive right to their respective writings and discoveries.
Page 124 - ... engines of larger dimensions. It was also ascertained, that unless the temperature of the cylinder itself were reduced as low as that of the vacuum, it would produce vapour of a temperature sufficient to resist part of the pressure of the atmosphere. All attempts, therefore, to...
Page 240 - This cloud and the air beneath it revolve about a central vertical axis, with inconceivable rapidity, and always in a direction contrary to the movement of the hands of a watch.
Page 182 - Now all know that the intensity of illumination varies inversely as the square of the distance.
Page 123 - By blowing the fire it was made to take a few strokes, but required an enormous quantity of injection water, though it was very lightly loaded by the column of water in the pump. It soon occurred that this was caused by the little cylinder exposing a greater surface to condense the steam than the cylinders of larger engines did in proportion to their respective contents.
Page 240 - The destructive violence of a tornado is sometimes confined to a path a few yards in width, or it may widen to the extreme limit of •eighty rods.
Page 123 - ... the engine would work regularly with a moderate quantity of injection. It now appeared that the cylinder of the model, being of brass, would conduct heat much better than the cast-iron cylinders of larger engines, (generally covered on the inside with a stony crust,) and that considerable advantage could be gained by making the cylinders of some substance that would receive and give out heat slowly.
Page 240 - The general direction of movement of the tornado is invariably from a point in the southwest quadrant to a point in the northeast quadrant.
Page 223 - The Committee on Science and the Arts constituted by the Franklin Institute of the State of Pennsylvania, for the promotion of the Mechanic Arts, to whom was referred for examination a Solar Compass, invented by WM.