Elements of Electricity, Magnetism, and Electro-magnetism: Embracing the Late Discoveries and Improvements, Digested Into the Form of a Treatise, Being the Second Part of a Course of Natural Philosophy, Compiled for the Use of the Students of the University at Cambridge, New England, Μέρος 2Hilliard and Metcalf, 1826 - 395 σελίδες Contains a treatise on electricity, magnetism, and electromagnetism. |
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Αποτελέσματα 1 - 5 από τα 73.
Σελίδα 8
... vertically by a cord from a fixed point S. If this vessel be not touched , it will remain at rest in virtue of the laws of equilibrium , and the fluid which it contains will give it no horizontal motion , because the lateral pressures ...
... vertically by a cord from a fixed point S. If this vessel be not touched , it will remain at rest in virtue of the laws of equilibrium , and the fluid which it contains will give it no horizontal motion , because the lateral pressures ...
Σελίδα 13
... vertical wire , the upper end of which is attached to a movable index , while the lower carries a horizontal needle . When very small forces are to be measured , they are made to act upon the extremity of this needle , and their ...
... vertical wire , the upper end of which is attached to a movable index , while the lower carries a horizontal needle . When very small forces are to be measured , they are made to act upon the extremity of this needle , and their ...
Σελίδα 14
... vertically within the glass covering , this ball may reach the level of the other ; and it is to be so placed that the ball ... vertical panes , which , together form a parallelopiped . In this case , the strip of paper containing the ...
... vertically within the glass covering , this ball may reach the level of the other ; and it is to be so placed that the ball ... vertical panes , which , together form a parallelopiped . In this case , the strip of paper containing the ...
Σελίδα 63
... vertical line C'P , we may decompose it into two other forces , one C'Q in the direction of the thread produced and which is des- troyed by the resistance of this thread , the other C'R perpen- dicular to the thread and tending to bring ...
... vertical line C'P , we may decompose it into two other forces , one C'Q in the direction of the thread produced and which is des- troyed by the resistance of this thread , the other C'R perpen- dicular to the thread and tending to bring ...
Σελίδα 76
... vertical position , augments in proportion as they be- come more oblique , it is manifest that the repulsive force which supports them is not simply proportional to their divergence , but follows a law less simple , depending on the ...
... vertical position , augments in proportion as they be- come more oblique , it is manifest that the repulsive force which supports them is not simply proportional to their divergence , but follows a law less simple , depending on the ...
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Άλλες εκδόσεις - Προβολή όλων
Elements of Electricity, Magnetism, and Electro-Magnetism: Embracing the ... John Farrar Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
according action attraction aurora borealis austral axis ball bundles centre charged circle communication condenser conducting bodies conducting power conductor copper Coulomb decomposition degree determine developed dipping needle directive force disc distance effect elec electric charge electric current electrified electroscope employed equal equilibrium exerted experiment extremity feeble free magnetism glass horizontal inch inclination influence insulated intensity length Leyden jar liquid loadstone magnetic equator magnetic forces magnetic meridian magnetic needle manner metallic meteor method motion natural electricities necessary netic number of oscillations observed opposite particles phenomena pile plane plate poles position produced proportional quantity of electricity ratio repelled repulsive force resinous electricity sealing wax sensible soft iron steel stratum substances suppose surface suspended take place terrestrial magnetism thread tion torsion torsion balance touch tourmaline tremity tricity tube uniting wire vertical vessel vitreous electricity voltaic apparatus voltaic pile zinc
Δημοφιλή αποσπάσματα
Σελίδα 87 - Normally the first production contract will have more changes than the second, the second more than the third, and so on.
Σελίδα 368 - ... of expense. The noise of the thunder generally occasions much alarm, although the danger is then passed ; it is over, indeed, on the appearance of the lightning, for any one struck by it neither sees the flash nor hears the report. The noise is never heard till after the flash, and its distance may be estimated at so many times 1136 feet as there are seconds between the appearance of the lightning and the sound of the thunder. Lightning often strikes solitary trees, because, rising to a great...
Σελίδα 366 - The general law or fact, in nature, so far as we can observe, is that all bodies attract each other in the direct ratio of their masses, and in the inverse ratio of the squares of the distances.
Σελίδα 370 - It is also advisable to have several paratonnerres round each magazine. If the magazine be in a tower, or other very lofty building, it may be sufficient to defend it by a double copper conductor, without any paratonnerre stem.
Σελίδα 368 - ... by it are frequently set on fire. No instance has yet occurred of an iron bar, of rather more than half an inch square, or of a cylinder of the same diameter, having been fused, or even heated red hot by lightning. A bar of this size would therefore be sufficient for a lightning-rod, but as its stem ought to rise from 15 to...
Σελίδα 369 - ... about 2^ inches square. • Iron being exposed to rust by the action of the air and moisture, the point of the stem is liable to become blunt; to prevent this, a portion is cut off from the upper end, about 20 inches in length, and replaced by a conical stem of brass or copper, gilt at its extremity^ or terminated by a small platina needle, two inches long.* The platina needle should be soldered with silver solder to the copper stem ; and to prevent its separating from it, which might sometimes...
Σελίδα 368 - When the lightning reaches the foot of the tree, it divides itself amongst the conductors that it finds near it, or strikes some in preference to others, according to circumstances, and sometimes it has been known to kill every animal that had sought shelter under the tree ; at others only a single one out of many has perished by the stroke. A...
Σελίδα 373 - These facts, together with ihe incapacity of the caloric fluid, extricated by the calorimotor, to permeate charcoal, next to metals the best electrical conductor, must sanction the position I assigned to it, as being in the opposite extreme from the columns of De Luc and Zamboni. For, as in these the phenomena are such as are characteristic of pure electricity, so in one very large galvanic pair, they almost exclusively demonstrate the agency of pure caloric.
Σελίδα 367 - This heat is sufficient to make a wire red-hot, or to fuse or disperse it, if sufficiently slender; but it scarcely raises the temperature of a bar of metal, on account of its large mass. It is by the heat of the electric current, as well as by that disengaged from the air, condensed by the passage of the lightning through it, when not conveyed by a good conductor, that buildings struck by it are frequently set on fire. No instance has yet occurred of an iron bar...