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Page 302 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 273 - ... choice made of the initial conditions of motion. The mechanical system is a generalized one, but it belongs to the domain of real dynamics. Let us consider the general problem of the motion of a rigid body under the action of any forces, in the non-Euclidian space whose absolute is the surfaC6: 3?+y*+*-t* = 0.
Page 346 - Maxwel1's theory of light be true, it moves out again still as electric and magnetic energy, but with a definite velocity and intermittent in type. We have in the electric light, for instance, the curious result that energy moves in upon the arc or filament from the surrounding medium, there to be converted into a form which is sent out again, and which, though still the same in kind, is now able to affect our senses.
Page 405 - ... further extremity. The result calculated from the total length of wire (even if this could be trusted), the length of the solenoid, and the number of turns, has an appearance of accuracy which is illusory unless it can be assumed that the distribution of the wire over the length is strictly uniform. It would appear that all the turns of the suspended coil should operate as much as possible, that is, that the suspended coil should be compact, and should be placed in the position of maximum effect....
Page 416 - To this we must add *009, making altogether 128*117, to allow for the gaining rate of the clock, which was 6^ seconds per diem. This corresponds to a mean temperature 17°-3. The procedure adopted was quite good enough for our purpose ; but if it were desired to push the power of the method to its limit, the work should be undertaken at an astronomical observatory, and extended over the whole time required to rate the clock by observations of the stars.
Page 335 - A space containing electric currents may be regarded as a field where energy is transformed at certain points into the electric and magnetic kinds by means of batteries, dynamos, thermoelectric actions, and so on, while in other parts of the field this energy is again transformed into heat, work done by electromagnetic forces, or anv form of energy yielded by currents.
Page 346 - ... zinc to earth, and suppose the sheath is everywhere at zero potential, then the wire will be everywhere at a higher potential than the sheath, and the level surfaces will pass through the insulating material to the points where they cut the wire. The energy which maintains the current and which works the needle at the further end travels through the insulating material, the core serving as a means to allow the energy to get into motion or to be continually propagated. This energy sucked up by...
Page 336 - ... and magnetic force, and that the amount crossing unit of area per second of this plane is equal to the product of the intensities of the two forces multiplied by the sine of the angle between them divided by...
Page 341 - ... while the direction of flow of energy is that in which a right-handed screw would move if turned round from the positive direction of the electromotive to the positive direction of the magnetic intensity.
Page 335 - ... led us, under the guidance of Faraday and Maxwell, to look upon the medium surrounding the conductor as playing a very important part in the development of the phenomena. If we believe in the continuity of the motion of energy, that is, if we believe that when it disappears at one point and reappears at another, it must have passed through the intervening space, we are forced to conclude that the surrounding medium contains at least a part of the energy, and that it is capable of transferring...