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School Spano |
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Function To study the photoelectric effect, i.e. the capacity of the light to supply enough energy to extract electrons from certain substances. | |||
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Description It is made of a steel plate that supports a thin layer of a compound of suitably worked selenium. On these layers a thin transparent metallic film is placed. | |||
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School University |
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Function To show the electric charge in very rarefied air. | |||
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Description Six tubes, with different pressures inside, are mounted on the same panel placed vertically on an wooden basis. The tubes are held a the bottom by a metallic strip with a binding post placed on the basis, at the top they are held by single metallic plates anchored to the panel. | |||
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School Spano (1), Castelvì (2) |
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Function To show the electric charge in very rarefied air. | |||
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Description They are made on fluorescent glace and hold very rarefied air. These tubes of different shapes and sizes are provided with ring joints with aluminium electrodes. | |||
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School University (1), Spano(2) |
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Function To study the electric discharges in a low and in a very low pressure environment. | |||
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Description Both have a spherical form with four electrodes and a shining wooden foot. With the first apparatus we can verify that the discharge happens following the shortest way between the two points of the current connection. With the second apparatus we can verify that the beam of cathode rays always follows the same direction whatever the anode connection. | |||
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School Spano |
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Function To show the mechanical action of the cathode rays. | |||
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Description It contains a light whirl sliding on glass guides. When it is struck by the cathode rays the whirl moves. | |||
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School Pellegrini |
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Function To show the electric conduction in rarefied gases. | |||
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Description The beam of the cathode rays comes into the central side of the tube through a slit. It is made visible by an oblique fluorescent screen when iy goes near it. | |||
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School University |
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Function To study the action of the magnetic fields on the cathode rays. | |||
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Description It contains a cathode at the thinner end, a metallic diaphragm with a central circular opening, and a thin mica layer covered with a fluorescent substance at the wider end. When it works, the beam of cathode rays that crosses the diaphragm, provokes the fluorescence on a small part of the mica disk, aligned with the cathode and the diaphragm hole. This demonstrates that the cathode rays go in a straight line from the cathode to the screen. If we approach a magnet between the diaphragm and the screen, the fluorescent spot moves. This demonstrates that the cathode rays are deviated by a magnetic field, and they behave as negative charged particles with great speed. | |||
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School University |
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Function To study the action of the cathode rays in the electric and magnetic fields. | |||
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Description It is similar to Braun’s tube, but it has also a capacitor with parallel plates. If we can set an electric field between the armatures, the spot on the screen moves from its initial position. The electrons deviate towards the plate with the highest potential. The tube can serve to determinate the speed of the cathode rays and the ration between an electron charge and its mass. | |||
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School University |
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Function To show the electric conduction in rarefied gases. | |||
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School University |
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Function To show the electric conduction in rarefied gases. | |||
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Description The tube shows three branches in the central part. The electrodes are placed on two of these, while the third is used to link it to a pneumatic pump. | |||
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School University |
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Function To show the electric conduction in rarefied gases. | |||
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Description It is formed by a glass tube, with two electrodes at the ends. The vacuum is obtained by linking the tube to a pneumatic pump. | |||
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School University (1), Spano (2) |
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Function To show the rectilinear motion of the electrons. | |||
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Description Along the trajectory of the electrons of a divergent beam we place an obstacle with the form of a Malta cross whose shadow we can see on the fluorescent screen. | |||
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School University (1), Spano (2) |
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Function To show that the bodies are transparent to x-rays. | |||
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Description The x-rays produced by this tube have a great penetration power and show clearly a hand and the wrist bones or the coin contained in a bag. | |||
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School Spano |
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Function Used in different electronics applications. | |||
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Description Electronic tube with a hot cathode with emission of electrons due to the thermionic effect. The control of the electron movement is made with the control electrode and the anode. | |||
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School Spano |
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Function Rectifier for low tension currents. | |||
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Description It is made of a little spring, and of which is placed in contact with a crystal of galena (PbS). The other end of the spring and the galena are connected to the electrodes of a plug that can be inserted in a circuit. | |||
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School University (1), Spano (2) |
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Function To individuate the bodies crossed by x-rays. | |||
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Description It is formed by a fluorescent screen placed on a pyramidal case with handle. | |||
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School Spano |
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Function To show the emission of charged particles by radioactive substances. | |||
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Description The salt is applied to the internal wall of a little glass bulb, that is protected by a metallic cage and closed in a massive brass case. If we draw the salt near an electroscope the leaves close whatever their divergence. | |||
