Electric shock

“ Great accumulation or condensation of the separate electric ethers attract each other so strongly, that they will break a passage through nonconducting bodies, as through a plate of glass, or of air, and will rend bodies which are less perfect conductors, and give out light and heat like the explosion of a train of gunpowder; whence, when a strong electric shock is passed through a quire of paper, a bur, or elevation of the sheets, is seen on both sides of it occasioned by the explosion. ”

“ Stimulus of electric shock is applied in the usual manner, by means of a sliding induction coil. The intensity of the induction shock is adjusted by gradually changing the distance between the secondary and the primary, till a minimally effective stimulus is found. In the study of the effect of direction of constant current on conductivity, non-polarisable electrodes make suitable electric connections, one with the stem and the other with the tip of a sub-petiole at a distance from each other of about 95 mm. ”

“ When the discharge of a coated electric is made through the body of a living animal, it occasions a sudden motion, by contracting the muscles through which it passes, and gives a disagreeable sensation commonly called the electric shock. ”

“ The flash of light, together with the explosion between the two opposite sides of a charged electric, is generally called the electric shock, on account of the disagreeable sensation it gives any animal whose body is made use of to form the communication been them. ”

“ Our only accurate knowledge in regard to fatal currents comes from the experience derived from electrocutions. From these it appears that an alternating current of 1,500 volts is deadly if it passes through the body for more than a few seconds and if the contact is perfect.
Death.—Death may ensue immediately as the result of an electric shock without any evident preliminary symptoms, or it may occur later, either as the direct result of the shock or as the consequence of the exhaustion produced by the burns and other injuries, or directly from the injuries themselves. ”

“ The heat produced by the electric shock is proportional to the square of the quantity of electricity discharged, and is so intense that it fuses metals and volatilizes substances, but its intensity is not felt to its full extent on account of the shortness of its duration. It is only accompanied by light when the electricity is obstructed in its passage through substance. ”

“ While the current is passing through the body, although it may burn and cause tingling and other unpleasant symptoms, there is no proper shock. In other words, an electric shock is caused only by a change in the amount of electricity passing through the body or a portion thereof. ”

“ The Gymnotus has the astonishing property of giving the electric shock to any person or number of persons, either by the immediate touch of the hand or by the mediation of any metallic conductor. The shock is interrupted by the intervention of a non-conducting substance. If the animal be touched only with one hand, a kind of tremor is felt in that hand only. The power of giving shocks depends entirely on the will of the animal. ”

“ The danger of electric shocks depends upon the amount of current passing through the body, the kind of contact, and the insulation of the body at the time. Moisture of the body or clothes will increase the effects of the shock. ”

“ Electric Shock.—Men frequently get knocked insensible by touching an electric cable or rail. The patient should be moved from the rail, but you have to be careful in doing this that you don’t get the electric shock also. In the first place put glass, if possible, for yourself to stand upon, or dry wood if glass is not obtainable, or put on india-rubber boots. Also put on india-rubber gloves before touching the patient. If you have none, wrap your hands in several thicknesses of dry cloth, and pull the patient away with a stick. ”

“ Some recent experiments by Professor Oliver and Dr. Bolam on the immediate cause of death by electric shocks seem to indicate that death is due to a sudden arrest of the heart's action and that simultaneous failure of the respiratory center and the heart, except with unusually high voltage, is very rare. It follows from this that resuscitation in apparent death from electric shock is made much more difficult than if the fatal result were brought about by respiratory failure. ”

“ Within the building to be illuminated, the electric fluid reaches the lamps along small copper wires, about the thickness of ordinary bell wire, which are covered with a coating of gutta percha to prevent the escape of the electricity, which might cause sparks or even fire, or in any case seriously injure any one who might come in contact with the bare metal, by giving him a very violent if not fatal electric shock. The lamps themselves may be fixed to ordinary gas brackets. ”

“ At the very most, we feel a little prick at the point of communication. But with the help of powerful apparatus at the disposal of science, the electric shock becomes painful and can be dangerous, or even mortal. When one is struck by a rather strong spark, one feels, particularly in the joints, a sudden shock that makes one tremble and feel weak in the knees. With a still stronger spark, the whole body is seized with a sudden shaking so violent that the joints seem to be severed and one is knocked down by the stroke. ”

“ The newness lay in the proper combination of old discoveries. Electric shock was one ingredient, a prolonged drastic application of it during the recreation of a situation that the victim had a weakness for. ”

“ If an ordinary wire of short length be used as the medium of communication between the two plates of an electromotor consisting of a single pair of metals, no management will enable the experimenter to obtain an electric shock from this wire; but if the wire which surrounds an electro-magnet be used, a shock is felt each time the contact with the electromotor is broken, provided the ends of the wire be grasped one in each hand. ”

“ The thunderbolt, a spark incomparably stronger than that of our electric machines, gives to men and animals an extremely violent shock; it throws them down, injures them, and even kills them instantly. Sometimes a person thus struck bears traces, more or less deep, of burning; sometimes not the slightest wound is to be seen. Death is not, therefore, as a rule, due to any wounds inflicted by the thunderbolt, but to the sudden and violent shock given to the body. Sometimes death is only apparent: the electric shock simply suspends the primary vital functions, circulation and respiration. ”

“ A man perching upon an electric light pole, repairing wires, may come in contact with a wire charged, say, to 2000 volts. He may receive a shock which throws him in an unconscious condition across another live wire which burns its way into his flesh, or he may fall to the ground and be killed by the fall. A workman may hold a tool so as to short circuit a current through it, making it red hot in his hands. So many men who have been shocked into unconsciousness by high voltage currents have recovered consciousness later that we cannot say how much current is required to kill a man. ”

“ A term in electro-therapeutics; the shock received when an electric
circuit, including the patient in series, is broken or opened.
Synonym--Opening Shock.
Shock, Electric.
The effect upon the animal system of the discharge through it of
electricity with high potential difference. Pain, nervous shock, violent
muscular contortions accompany it. Of currents, an alternating current
is reputed worse than a direct current; intermediate is the pulsatory
current.
The voltage is the main element of shock, amperage has also some direct
influence. ”

“ For this purpose they invariably use a pulsating or alternating current and reduce the resistance by using metal handles and wet sponges for contact with the skin, but even so a very small amount of current passes. The moderate twitching of the muscles seems to be the end sought.
Men who are supposed to be killed by electric shocks often die from other causes. ”

“ They all give the shock and can decompose water, but with Volta-electric currents the elevation of temperature as well as their physiological and magnetic effects are produced by instantaneous actions, which only depend upon the quantity and tension of the current, and by no means on its duration, for induced currents only exist for a moment when the circuit of the battery is broken. The most energetic physiological effects are produced by a small quantity of electricity moving with great velocity. ”

“ We have seen several women so powerfully electrized in these circles, that the same effects were produced upon them which would have been had they been isolated in connection with a galvanic battery." So it has been seen that, on touching Angelique Cottin, a person would receive a "true electric shock." This kind of shock was experienced by Campeti and Bleton, in passing over mineral veins and subterraneous streams, as mentioned by Dr. ”

“ If, for example, on a winter day in a cold climate, you walk briskly along a wool carpet, the friction of your feet with the carpet generates a store of statical electricity, which immediately passes over the entire surface of your body. If now you touch another person or a metal conductor, such as a steam radiator or a gas pipe, a brilliant spark jumps from your finger, and you experience what is spoken of as an electrical shock. ”

“ Electricity when confined to substances resisting its progress, as air, glass, dry wood, stones, &c., exerts a terribly explosive power.
3. But when confined to bodies, such as metals, offering small resistance, its violent expansion or disruptive action is greatly reduced or avoided altogether, and becomes a continuous current comparatively quiescent. But if body be small, as wire, it may be heated or fused. Resistance is so small that a shock has traversed copper wire at the rate of 576,000 miles a second; resistance increases with length and diminishes with area of section of conductor. ”

“ The intensity of the current can be maintained uniform if we always employ the same battery, say a 4-volt accumulator or storage-cell. As the break of a current is accomplished more quickly than make, the break-shock, as we have seen, is more intense than the make-shock. ”

“ A person's body is not a very good conductor of electricity, but will conduct it somewhat. When electricity goes through your body, you get a shock. The shock from the ordinary current of electricity, 110 volts, is not enough to injure you at all; in fact, if you were standing on dry wood, it would be safe, although you would get a slight shock, to connect the blade of a knife switch to the slot of the switch, through your hand or body. Your body would not allow enough current to pass through it to light the lamp. ”

“ How can we suppose an electrical explosion without 300some vapors collected together, capable of containing unequal charges of electricity, in air, the mean temperature of which is, perhaps, twenty-five degrees below the freezing-point of the centigrade thermometer, and the rarefaction of which is so considerable, that the compression of the electrical shock could scarcely disengage any heat? ”

“ When the atoms get into a very intense state of commotion they have a tendency to induce explosion, unless a way of escape is found—escape for the energy, not for the atoms. Now, when you cause chemical disturbance in an electric battery, the energy thus evolved is called electricity, and we provide a conductor of escape for it in the shape of a copper or other metal wire, which we may carry to any distance we please, and the energy runs along it, as the wave runs along the carpet, as long as you keep up the commotion in the battery among the excited atoms of copper and zinc. ”

“ Let us now compare these figures with some actual cases, taking as an example a system of incandescent lighting. In these systems the difference of potential between any two points of the circuit outside of the lamps does not exceed 150 volts. Taking this figure, therefore, it will be seen that under no circumstances can the shock received from touching these wires become dangerous--not even by touching the terminals of the dynamo itself; because in neither case can a current be driven through the body, sufficient to cause an excessive contraction of the muscles. ”

“ There can be no doubt, from thousands of observations made, that it is one of the characteristics of the electric force to seek its way towards water—to be, as it were, dissolved by it, or, as perhaps it might be said more truly, to be equalised by it. A very remarkable electrical phenomenon, and one which is often attended with fatal results to men and animals, is what is known as the ‘return stroke’ of a lightning discharge. ”

“ These were invariably shattered by the passage of the spark on account of the accompanying elevation of temperature, which caused expansion. He also established the facts that the atmosphere adjacent to an electrified body acquires electrification of the same sign by abstracting electricity from the body, and that the air then parts with its electricity very slowly. He advanced the theory that there is a mutual repulsion between the particles of the electric fluid and those of air, and that a temporary vacuum is formed at the moment of the passage of a disruptive discharge or spark. ”

“ The same writer observes, "Persons sometimes feel a sensation of electricity passing over their limbs when they stand in the vicinity of those who get the sounds most freely, although the particular persons who seem to be the mediums feel no sensation at all. In one or two instances we have seen a perceptible shock, as if caused by a galvanic battery, especially when the persons were under the influence of magnetism." ”