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acid alternating currents amperes angle apparatus armature axis ball battery body bulb called carbon cell center of mass centimeter circuit coil colors conductor connected convex lens copper wire cork density determine diameter difference direction disk distance draw dynamo edge electric electrification electromotive force electroscope equal ether ether waves Exercise Experiment feet flame Florence flask focal focus galvanometer galvanoscope glass heat horizontal inches increase insulated iron lamp length lens Leyden jar light lines of force liquid magnetic measure mercury metal mirror motion move needle notice ohms oscillation paper parallel pass pendulum piece Place plane plate pole position potential pounds pressure prism produced radiant energy radiation rays reflected refraction represents resistance screen shown in Fig side sound spectrum square strip substance surface temperature terminals thermometer tion tube tumbler velocity vertical vibrations voltaic voltaic cell volts wave-length waves weight zinc
Page 159 - Principle states that a body wholly or partially immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by it.
Page 92 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 296 - ... to that required to raise the temperature of the same weight of water one degree from the temperature of maximum density 39.1 is commonly called the specific heat of the substance.
Page 161 - The specific gravity of a substance is the ratio between the weight of any volume of the substance and...
Page 199 - E ; each boy, after the transmission ot the push, becoming himself erect. E, having nobody in front, is thrown forward. Had he been standing on the edge of a precipice, he would have fallen over; had he stood in contact with a window, he would have broken the glass ; had he been close to a drum-head, he would have shaken the drum.
Page 5 - ... laboratory as it is in the ordinary recitation or lecture room. The great utility of the laboratory note-book is emphatically stated. To the objection that the kind of instruction described requires much time and effort on the part of the teacher, the Conference reply that to give good instruction in the sciences requires of the teacher more work than to give good instruction in mathematics or the languages ; and that the sooner this fact is recognized by those who have the management of schools...
Page 306 - We have now to try and realize the idea of ' a perfectly continuous, subtle, incompressible substance pervading all space and penetrating between the molecules of all ordinary matter, which are embedded in it, and connected with one another by its means.
Page 146 - The pressure per unit of area exerted anywhere upon a mass of liquid is transmitted undiminished in all directions, and acts with the same force upon all surfaces, in a direction at right angles to those surfaces.