Τι λένε οι χρήστες - Σύνταξη κριτικής
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Άλλες εκδόσεις - Προβολή όλων
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Σελίδα 195 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Σελίδα 195 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Σελίδα 422 - I call the steam vessel, must, during the whole time the engine is at work, be kept as hot as the steam that enters it; first, by inclosing it in a case of wood, or any other materials that transmit heat slowly; secondly, by surrounding it with steam or other heated bodies; and thirdly, by suffering neither water nor any other substance colder than the steam, to enter or touch it during that time.
Σελίδα 435 - All these cities were connected with each other, and with the capital, by the public highways, which, issuing from the Forum of Rome, traversed Italy, pervaded the provinces, and were terminated only by the frontiers of the empire. If we carefully trace the distance from the wall of Antoninus to Rome, and from thence to Jerusalem, it will be found that the great chain of communication, from the north-west to the south-east point of the empire, was drawn out to the length of four thousand and eighty...
Σελίδα 436 - Mountains were perforated, and bold arches thrown over the broadest and most rapid streams. -The middle part of the road was raised into a terrace, which commanded the adjacent country, consisted of several strata of sand, gravel, and cement, and was paved with large stones, or in some places near the capital with granite.
Σελίδα 422 - I intend, in many cases, to employ the expansive force of steam to press on the pistons, or whatever may be used instead of them, in the same manner as the pressure of the atmosphere is now employed in common fire engines.
Σελίδα 6 - The squares of the periodic times of any two planets are to each other, in the same proportion as the cubes of their mean distances from the sun.
Σελίδα 43 - ... in a direction contrary to the motion of the hands of a watch, with — and be this particularly noted — a constant tendency to turn inwards towards the centre of least pressure.
Σελίδα 435 - The public roads were accurately divided by mile-stones, and ran in a direct line from one city to another, with very little respect for the obstacles either of nature or private property. Mountains were perforated, and arches thrown over the broadest and most rapid streams.