The Scientific Class-book, Or, A Familiar Introduction to the Principles of Physical Science: For the Use of Schools and Academies, on the Basis of Mr. J.M. Moffat, with Additions, Emendations, Notes, Questions for Examination, Lists of Works for Reference, Some Additional Illustrations, and an Index, Band 1Key & Biddle, 1835 |
Häufige Begriffe und Wortgruppen
action air-pump angle aperture apparatus appear applied ascertained atmosphere atmospheric pressure attraction ball body cause centre of gravity centrifugal force circumstances colours common compressed concave construction convex convex lens cylinder degree density depend described diameter direction distance earth effect elastic electricity equal exhibited experiments Fahrenheit fall feet figure fluid force Franklin Institute friction gases glass glottis heat Hence inches inclined plane instrument latter length lens lenses lever light liquid machine magnetic manner mass means mechanical mercury metal mirror motion moving Natural Philosophy object observed pass peculiar pendulum phenomena philosophers piston plane plate pole pounds pressure principle produced proportion pyrometer quantity rays reflected refraction relative retina screw side solid sound space specific gravity string substances supposed surface takes place temperature thermometer tion tone Treatise tube valve velocity vessel vibrations voltaic pile weight wheel wire zinc
Beliebte Passagen
Seite 28 - Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
Seite 61 - For since the time of vibration is to the time of descent through half the length of the pendulum, as the circumference of a circle to its diameter, that is, as 3.14159 to 1?
Seite 427 - ... of the whole quantity of matter in the earth. But the attraction of a quantity of matter at the earth's centre would be more powerful on a body at the bottom of a mine than on one at the top, in the inverse ratio of the squares of the distances...
Seite 452 - It consists of a bar of soft iron, bent into the form of a horse-shoe, and wound with twenty-six strands of copper bell-wire, covered with cotton threads, each thirtyone feet long; about eighteen inches of the ends are left projecting, so that only twenty-eight feet of each actually surround the iron. The aggregate length of the coils is therefore 72d feet.
Seite 235 - ... perceives them may be said to possess another sense, agreeing with our own solely in the medium by which it is excited, and possibly wholly unaffected by those slower vibrations of which we are sensible."* 21.
Seite 1 - PINNOCK'S IMPROVED EDITION OF DR. GOLDSMITH'S HISTORY OF ENGLAND, from the Invasion of Julius Caesar to the death of George II., with a continuation to the year...
Seite 157 - A raft will float, because it is absolutely lighter than water, and a life-boat also for the same reason ; but vessels in general, from the cock-boat to the largest man of war, owe their buoyancy to their concave form. Hence ships need not be built of fir or any light wood, since not only the heaviest woods might be used but...
Seite 215 - Now when the piston is at the bottom of the barrel, the pressure of the atmosphere on the surface of the water in the well...
Seite 84 - A similar contrivance is adopted to equalize the effect of power applied in raising ore from a deep mine ; for the rope, when at its greatest length, (and consequently when the resistance of the weight is greatest), is coiled about the narrow end of the axle, and the successive coils advance towards the wider extremity, as the resistance diminishes by the shortening of the rope. 182. As the efficiency of the wheel and axle, whatever may be its peculiar construction, is to be estimated by the ratio...