Electricity Made Simple and Treated Non-technicallyC. Macdonald, 1899 - 229 стор. |
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Electricity Made Simple and Treated Non-Technically: An Invaluable Treatise ... Clark Caryl Haskins Попередній перегляд недоступний - 2017 |
Загальні терміни та фрази
action alternate alternate current amount of current ampere apparatus armature attraction battery brushes carbon cell CHAPTER chemical circuit closed coating coil combination conductor connected copper core current flow deflected developed difference direction disc discharge disruptive discharge dynamo earth earth battery elec electrical conditions electrified electro-magnet electro-motive force electrode electrolyte electroscope energy experiment field fluid galvanometer heat illustrated inches increase induction insulated iron Joule known lamp leyden jar light lines of force machine magnet metal method motion motor moving needle negative nitric acid Ohm's law ohms opposite outer pith balls placed Planté plate platinum polarity pole portion positive potential pressure produced repelled repulsion resistance result reverse revolving rheostat sheet shellac shown in Fig shunt solution spark STATIC ELECTRICITY sulphuric acid surface telegraph terminal tion tricity voltage volts watt-hour Wheatstone bridge wire zinc
Популярні уривки
Сторінка 73 - ... between the ribs. Place your elbows firmly against your hips, and using your knees as a pivot press upward and inward toward the heart and lungs, throwing your weight slowly forward for two or three seconds, until your face almost touches that of your patient, ending with a sharp push which helps to jerk back to your first position. At the same time relax the pressure of your hands so that the ribs, springing back to their original position, will cause the air to rush into the subject's lungs....
Сторінка 50 - ... proving experimentally with his historic kite, and the aid of leyden jars, that, excepting the factors of quantity and intensity, the two were one. Franklin enumerated the following specific characteristics pertaining to, and tending to show that lightning and the spark were but different manifestations of static electricity : "Giving light ; color of the light ; crooked direction ; swift motion ; being conducted by metals ; noise in exploding ; conductivity in water and ice ; rending imperfect...
Сторінка 21 - I went into the cube and lived in it, and using lighted candles, electrometers, and all other tests of electrical states, I could not find the least influence upon them, or indication of anything particular given by them, though all the time the outside of the cube was powerfully charged, and large sparks and brushes were darting off from every part of its outer surface.
Сторінка 72 - Place the subject on his back, head down and bent backward, arms folded under the head (under no conditions raise the head from the ground or floor). Place a hard roll of clothing beneath the body, with the shoulders declining slightly over it. Open, the mouth, pull the tongue forward, and with a cloth wipe out saliva or mucus. Thoroughly loosen the clothing from the neck to the waist, but do not leave the subject's body exposed, for it is essential to keep the body warm ; kneel astride the subject's...
Сторінка 149 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2. J of the electromotive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15°...
Сторінка 149 - The International Ohm is the unit of resistance and is defined as the resistance offered to an unvarying current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, 106.300 cm.
Сторінка 31 - ... those which have the sharpest convexity, while hollows and indentations show little or no charge. In consequence of this strain, at a sharp projection on a charged- conductor, or still more markedly, at a point, as in a sharpened wire, the condensation of such an amount of force within such small space produces a very rapid escape of electricity from such points. For this reason conductors which it is desired should retain their charge should have no edges or points, and must be very smooth....
Сторінка 26 - ... of the movable disc. If now the disc be turned round, this + charge on the back comes over from the left to the right side, in the direction indicated by the arrow, and, when it gets opposite the comb, increases the inductive effect of the already existing + charge on the armature, and therefore repels more electricity through the brass rods and knobs into the left comb. Meantime the — charge which we saw had been induced in the left armature, has in turn acted on the left comb, causing a +...
Сторінка 33 - ... beyond the striking distance of a spark, one of these brushes will reach for the object so presented. The brush discharge consists of a short stalk, from which spreads a shape not unlike a palm leaf fan, consisting of rays which become thinner and lighter towards their outer extremity. Example 5. If a doll's head having hair, be placed on the terminal of the machine, and the machine actuated, the hair will tend to straighten out in all directions, and will reach for the hand or other conductor...
Сторінка 68 - ... if on hill sides, have. 2. Use a good iron or copper conductor. If the latter, one weighing about 6 ounces to the foot, and preferably in the form of tape. If iron is used and it seems to be in every way as efficient as copper, have it in rod or tape form and weighing about 35 ounces to the foot. "A sheet of copper constitutes a conductive path for the discharge from a lightning stroke much less impeded by self-induction than the same quantity of copper in a more condensed form, whether tabular...