Philosophical Essays: On the Following Subjects : I. On the Ascent of Vapours, the Formation of Clouds, Rain and Dew, and on Several Other Phoenomena of Air and Water, II. Observations and Conjectures on the Nature of the Aurora Borealis, and the Tails of Comets, III. On the Principles of MechanicksJohn Nourse, 1767 - 177 σελίδες |
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Συχνά εμφανιζόμενοι όροι και φράσεις
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Δημοφιλή αποσπάσματα
Σελίδα 31 - ... close together by the force of the winds, they will run into drops heavy enough to fall down in rain. If the clouds are frozen before their particles are gathered into drops, small pieces of them being condensed, and made heavier by the cold, they fall down in flakes of snow. If the particles are formed into drops before they are frozen, they become hailstones. When the air is replete with vapours, and a cOld breeze springs up which checks the solution of them in the air, clouds...
Σελίδα 30 - The clouds, therefore, are generally higher in summer than in winter ; in the former reason they are from one mile to three miles high, and in the latter from a quarter of a mile to a mile. When the clouds are much increased by a continual addition of vapours, and their particles are driven close together by the force of the winds, they will run into drops heavy enough to fall down in rain. If the clouds are frozen before their particles are gathered into drops, small pieces of them being condensed,...
Σελίδα 154 - G are to each other inverfely as the perpendicular diftances of their lines of direction from the point...
Σελίδα 96 - ... comets consist of a lucid self-shining substance, which has not the power of refracting or reflecting the rays of light. — (Essays.) The tail of the comet of 1744 at one time appeared to extend above 16 degrees from its body, and must have thence been above twenty -three millions of miles long. And the comet of 1680, according to the calculations of Dr. Halley on November the...
Σελίδα 160 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
Σελίδα 139 - An additional example may be useful for the illustration of the same subject. It is well known to be a general principle in mechanics, that when, by means of any machine, two heavy bodies counterpoise each other, and are then made to move together, the quantities of motion with which one descends, and the other ascends perpendicularly, are equal.
Σελίδα 159 - ... reft; and will be in equilibrio. Therefore it is eafy to fee how, from the theorem now demonftrated, we may prove the property of the lever in that cafe where the directions of the forces are parallel ; and from thence the other cafe, in which the directions are oblique to each other, may be deduced by the refolution of forces, as is ufually done. And this is the ad method by which I faid the general property of the lever might be ftrictly demonftrated.
Σελίδα 141 - ... upon them both together as if they were really but one. And therefore, without contradicting the laws of motion, I might fuppofe the...
Σελίδα 163 - And consequently, if the power which acts on one rope be equal to the weight divided by the number of ropes, that power must sustain the weight. This principle may be applied to many of the cases which occur, with great facility ; particularly when the cords run in directions nearly parallel, as in the systems exhibited, iig.
Σελίδα 142 - ... especially as both their motions taken together may be less than what the difference of the weights, which is here supposed to be the moving force, would be able to produce in a body falling freely. However, as the theorem above mentioned is a very elegant one, it...