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School Spano |
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Function To study the resultant of coplanar forces. | |||
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Description It includes a polished mahogany circle table, to which we can apply three chucks with pulleys. On the throat of these pass three flexible threads, linked at one end to a light ring. At the other end of the three threads we apply variable weights, two of which represent the component forces and the other the resultant. The chucks also fix the graph of the composition of the forces on the table. With the apparatus we find joined a set of twelve equal brass weights with hook and eyelet tosuspend them in cascade, and two graphs in case the components form a right angle, and in case two components have directions at acute angle. | |||
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School Spano |
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Function To study the resultant of parallel forces. | |||
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Description A light aluminium bar is divided into twelve equal and separated segments by brass eyelets. It is held by two flexible threads that pass through the throat of the equal pulleys, mounted on two parallel columns with variable height. Two weights equal to half weight of the bar hold it in equilibrium in horizontal position. By applying two forces (components) under the equilibrating weights, we can find the resultant represented by the weights that we must apply to one of the eyelets to hold the bar in equilibrium and in horizontal position. In this way we verify the law of the composition of parallel forces. The apparatus is set on a walnut basis and it is furnished with a set of twelve equal brass weights with hook and eyelet to arrange them in cascade. | |||
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School Castelvė |
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Function To study the composition of the forces and the levers. | |||
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Description The apparatus is composed of three poles placed on circular bases. Two poles have a pulley on top while the third is shorter and has a hole for a horizontal pole on its top. It is possible to make experiments on the levers. | |||
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School Spano |
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Function To study the power and the resistance of fixed, or mobile pulleys, the three-couple tackle in the same plane and the three-couple tackle on the same axis. | |||
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Description The painted zinc pulleys are held by brass flasks with steel axes. They move with negligible friction. We can verify that the power equals the strength in the fixed pulley; in the mobile pulley the power is half the strength, and in the other compound types, the power is a sixth of the strength. By hanging a scale to the horizontal bar of the support, and reading the vertical shifts of the application point of the power and of the strength, we can verify that in every case the work executed by the power is equal to that required by the strength, and that the engines create or multiply do not the work, but only modify the two factors that determine it. A set of twelve equal weights to be applied to the support is given along with the apparatus. | |||
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School Castelvė, Spano |
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Function Simple machine. | |||
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Description The inclined plane is formed by a hard wooden table hinged to another table that is used as basis. Along the table are present two runners where the wheels of the trolley run. At the other end of the table there is a pulley across which passes a thread to which is linked a weight that keeps the trolley in equilibrium. A metallic graduated arc is used to read the angle that the inclined plane forms with the horizontal plane. | |||
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Function Simple machine derived from the inclined plane. |
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Description It is formed by a hard wooden prism with a triangular section. | |||
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School Spano (1), Pellegrini (2) |
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Function Simple machine derived from the inclined plane. | |||
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Description The two pieces are cut in hard wood. The nut is divided into two parts. | |||
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School Spano (1), Pellegrini(2) |
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Function It allows raising great weights with small forces. | |||
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Description Simple wooden machine. | |||
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School Spano (1), Pellegrini(2) |
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Function It allows raising great weights with small forces. | |||
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Description Simple wooden machine. | |||
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School Spano |
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Function Research of the centre of gravity. | |||
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Description Apparatus used for the research of the centre of gravity. It is composed of a support with plumb line, a lateral hook, and a tip at the top to control the centre of gravity. The figures are hanging from the lateral hook that the apparatus is provided with. | |||
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School Spano, Pellegrini |
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Function To study the condition of equilibrium of leaning bodies. | |||
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Description With the little pendulum applied to the centre of gravity we verify the condition of equilibrium of leaning bodies. The parallelepiped is formed by three wooden, equidistant and parallel planes articulated by four thin wooden bars, that form the lateral edges. | |||
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School Pellegrini |
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Function To study the equilibrium. | |||
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Description A cone with two arc-shaped arms rests on its pointed end on a support that is hollow at the top. At the end of the arc there are two spheres, one of which is fixed, while the other can move on the arc so that we can obtain the various types of equilibrium. | |||
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School Spano (1), Pellegrini (2) |
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Function To study the stable, unstable, or neutral equilibrium for leaning bodies. | |||
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Description If we lay the cone on the base we obtain a stable equilibrium. If we lay it on the top we obtain an unstable equilibrium and if we lay it on the lateral surface we obtain a neutral equilibrium. | |||
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School Pellegrini |
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Function Mechanical paradox. To show that the centre of the mass tends toward the lowest level. | |||
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Description A wooden cylinder contains a mass of lead in an eccentric position. In that way the centre of the mass is placed far from the axis of the cylinder. By placing the cylinder in a particular position with the mass of lead over it, the disc rises to bring the centre of the mass to the lowest position. | |||
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School Spano |
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Function Mechanical paradox. To show that the centre of gravity tends to the lowest possible level. | |||
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Description The double cone of polished wood apparently climbs on the inclined plane. | |||
