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School University (1), Spano (2) |
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Function Charging by rubbing. | |||
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Description These rods charge very strongly. The glass rod is polished with emery along half of its length (30 cm - 1 foot) The metallic rod with insulating handle is used to control the behaviour of the insulators and the conductors. | |||
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School Spano |
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Function Insulator for different experiments. | |||
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Description Model with a metallic plate supported by a glass column, that rises from the bottom of a container meant to hold the concentred sulphuric acid. | |||
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School Spano |
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Function Insulator for different experiments. | |||
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Description The stand has a wooden plane. The four glass feet are fixed with brass escutcheons. With this stand we can charge a person placed on it by rubbing him. With a finger the person will touch the sphere of the plate of an electroscope, while its clothes are quickly beaten with a tanned cat-skin. | |||
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School Spano |
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Function Useful for different electrostatic experiments. | |||
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Description It is formed by very light tissue paper balloons. The foot is made of metal. The column is a varnished glass pole, with an ebonite connection and a sliding bar. The support is very large not to act inductively on the charged pendulums. The suspension siek threads leave from a metallic ring, that is used to hang the balloons from the terminal hook of the bar. | |||
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School Spano |
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Function With this apparatus it is easy to demonstrate that the electric charge distributes itself on the external surface of metals. |
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Description The brass cloth is provided on the two sides with many strips of differently coloured tissue paper. The cloth lies on two very heavy insulating feet, so as to keep the shape that we give it, i.e. flat, concave or an S shape. With a small chain we connect the cloth to the electrostatic machine. In the first case (flat) we can see the strips rise on the two sides, in the second case (concave) only the strip on the external side rises, in the third case half the strips will rise on both sides. In the second case if we change the curvature of the cloth, the lower strips rise and the upper strips get lower. | |||
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School Castelvì(1), Spano (2) |
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Function To show that the charge of a conductor does not exercise any action inside it. | |||
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Description The hood is formed by a metallic cylindrical cloth that ends with a spherical cap. The experiments are used to demonstrate that inside the hood the induction phenomena does not exist and neither do any electric forces, nor electric charges. | |||
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School Spano |
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Function To show the distribution of the electric charge in the metals. | |||
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Description It is formed by a metallic sphere supported by an insulating pole fixed on a tripod. The sphere is hollow and has a hole on its top. If a small insulated sphere is charged and placed inside the sphere, we can then verify that the charge placed on the internal surface has gone to the external surface. | |||
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School University (1), Spano (2) |
 (1)
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Function To show the electric charge distribution on metals. |
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Description A cylindrical metallic container hangs from three columns placed at 120 degree angles. A double lid, that fits perfectly on the cylinder, holds a metallic sphere insulated by an insulating bar that slides along the cover axis. By placing the charged sphere inside the cylinder, the external surface is charged by induction so that the little balls of the pendulums are attracted. If we put the sphere in contact with the internal surface of the cylinder we can verify that all the charge has passed into the cylinder. | |||
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School Spano |
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Function To show the electric charge distribution on metals. | |||
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Description It includes a metallic insulated sphere and two hollow hemispheres with insulating handles, that cover the entire sphere. If the two hemispheres are detached simultaneously, the charge by the sphere goes to the hemispheres. | |||
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School Spano |
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Function To show the distribution of the induced charges. | |||
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Description The insulating support on a tripod holds an insulated sphere, a varnished glass dielectric screen and a cylindrical conductor with three pendulums in correspondence with the centre and with the ends of the conductor. A positive charge on the sphere induces a negative charge in the lower part of the cylindrical conductor and a positive charge in the upper part, so that the two terminal pendulums diverge while the central pendulum stays still. We can verify the type of the induced charge by successively approaching a rubbed ebonite and a rubbed glass bar to the two pendulums. If we touch the cylindrical conductor with the hand, then it becomes part of a big conductor that includes the person and the earth. The nearest part to the sphere will be therefore the cylindrical conductor and the operator’s hand, and the induced charge contrary to that of the sphere will be on the conductor. In fact, if we remove the hand and in the same time we discharge the sphere, the three pendulums rise and the entire cylindrical conductor presents a charge contrary to that of the sphere. | |||
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School Castelvì (1), Spano (2) |
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Function To show the distribution of the induced charges. | |||
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Description It is formed by a cylindrical conductor on an insulated stand and by pendulums at the ends. It serves for experiments on induced charges and on the electric density of a conductor that presents different curvatures. | |||
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School Castelvì |
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Function To show electric attractions and repulsions. | |||
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Description Two bars of insulating material with one bell on the ends, are placed on a rectangular wooden basis. A small metallic hammer hangs from a third bar placed between the other two. If we connect the two bells to the poles of an electrostatic machine the hammer is attracted in succession by the two bells. If one of the two bells is placed on the ground and the other is charged by contact, the oscillation diminishes little by little. This happens because the charged bell loses its electric charge. | |||
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School Azuni |
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Function To show electric attractions and repulsions. | |||
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Description A bell is anchored to a vertical pole. Two other bells hang on the sides of the first one. Between them hang two metallic little balls. By earth-connecting the central bell and the lateral bells to an electrostatic machine, the two little balls are charged by induction and attracted by the lateral bells. Then they are pushed back towards the central bell because their charge becomes of the same sign as the bells. When in contact with the central bell they discharge and the cycle starts over again. | |||
