|
Function To study the photoelectric effect, i.e. the capacity of the light to supply enough energy to extract electrons from certain substances. |
| ||
|
|||
|
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. | |||
Menu
|
Function To show the electric charge in very rarefied air with fluorescent liquids. |
 | ||
|
|||
|
Description They contain one or more fluorescent liquids in very rarefied air. These tubes of different shapes and sizes are provided with ring joints with aluminium electrodes. | |||
Menu
|
Function To study the electric discharges in a low and in a very low pressure environment. |
| ||
|
|||
|
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. | |||
|
Function To show the mechanical action of the cathode rays. |
| ||
|
|||
|
Description It contains a light whirl sliding on glass guides. When it is struck by the cathode rays the whirl moves. | |||
|
Function To show the rectilinear motion of the electrons. |
| ||
|
|||
|
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. | |||
|
Function To show that the bodies are transparent to x-rays. |
| ||
|
|||
|
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. | |||
|
Function Used in different electronics applications. |
| ||
|
|||
|
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. | |||
|
Function Rectifier for low tension currents. |
| ||
|
|||
|
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. | |||
|
Function To individuate the bodies crossed by x-rays. |
| ||
|
|||
|
Description It is formed by a fluorescent screen placed on a pyramidal case. | |||
|
Function To show the emission of charged particles by radioactive substances. |
| ||
|
|||
|
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. | |||
