Lessons in Elementary Practical Physics, Volume 1Macmillan and Company, limited, 1901 |
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Common terms and phrases
accuracy adjusted angle angular Apparatus.-A apparent weight arithmetical mean arms axis balance barometer beam beam compass body brass burette cathetometer centre clamp coefficient coincidence convenient correct cross-threads cross-wire cubic centimètre curve cylinder datum circle denote determined diameter difference distance divided ellipse equal error fixed flask following table formula give glass graduated grammes grms Hence horizontal hydrometer inch instrument kilogramme knife-edge length LESSON liquid mark means measure meniscus ment mercury method mètre metrical system micrometer microscope milligramme millimètre scale moment of inertia motion observations obtained ordinates oscillation pendulum physical placed plane planimeter platinum pointer position pressure radius reading relative density scale division screw sensibility Simpson's rules specific gravity Spherometer standard suppose swing telescope temperature thread tion true weight tube unit vacuo Vernier vertical vessel vibration volume wheel wire wire-gauge zero point
Popular passages
Page 2 - ... the centimeter as the unit of length, the gram as the unit of mass, and the second as the unit of time.
Page 144 - ... adding weights until the oscillations are equal on both sides of the mark, the difficulty may be overcome. Finally, let observations be made at various temperatures, one of these being, as nearly as may be, 4° C. Method of Calculation. — When the hydrometer floats in water up to the mark m, the weight of the liquid displaced is equal to the weight of the hydrometer. Let V denote the volume of the instrument up to mark m, and let W be its weight ; then, if weights p and p...
Page 169 - From which it is seen that the torsional couple is directly proportional to the fourth power of the radius, and inversely proportional to the length of the cylinder, a result we have previously shown to be true from first principles. 1 If any of our readers are not familiar with integration, the correctness of this expression may be...
Page 243 - ... |MV2, where M is the mass and V the velocity of the body. In making use of this expression to find the energy of a rotating body we perceive that we must consider the velocities and masses of the individual particles of which it is composed. Calling mv...
Page 210 - When the sign of the Correction is + , the quantity is to be added to the observed scale reading, and when — to be subtracted from it...
Page 1 - THE SCIENCE OF WEIGHING AND MEASURING, AND THE STANDARDS OF MEASURE AND WEIGHT. By HW CHISHOLM, Warden of the Standards. With numerous Illustrations. Crown 8vo.
Page 190 - ... that the moment of the torsional couple called into action is proportional to the circular displacement The same method might be extended to prove the other torsional laws by obtaining the time of vibration with wires of different lengths and diameters. We have here the well-known formula...
Page 1 - The yard1 is denned by Act of Parliament to be the straight line or distance between the centres of two gold plugs in a bronze bar deposited in the office of the Exchequer, the temperature of the bar being 62° Fahr. When it is convenient to use smaller units of length, the foot, or ^ of a yard, and the inch, or -^ of a foot, are employed.
Page 223 - ... be wound as far as it will go, that is, until it resists further winding. This resistance is produced not by the end of the chain, but by a catch provided to act at the proper time and thus protect the chain. When a chronometer has stopped, it does not again start immediately after being wound up. It is necessary to give the whole instrument a quick rotatory movement, by which the balance wheel is set in motion.