Vacuum tubes


 

 

 

 

 

 

 

   

VACUUM SCALE

 
 School
  University

  Function
 
Maker:
Max Kohl - Chemnitz
Price:
£ 51
Purchase date:
1908

  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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CROOKES'S TUBE WITH THREE ANODES


  Function
  To study the electric discharges in a low pressure environment.
Maker: Unsigned Price: L 50 Purchase date: 1923

  Description
    It has a spherical form with four electrodes and a shining wooden foot.
  With the apparatus we can verify that the discharge happens following the shortest way between the two points of the current connection.

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BRAUNíS TUBE


  Function
  To study the action of the magnetic fields on the cathode rays.
Maker: Unsigned Price: Purchase date:

  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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BRAUN-WEHNELTíS TUBE


  Function
  To study the action of the cathode rays in the electric and magnetic fields.
Maker: Unsigned Price: L 450 Purchase date: 1923

  Description
    It is similar to Braunís 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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VACUUM TUBE


  Function
  To show the electric conduction in rarefied gases.
Maker: Unsigned Price: Purchase date:

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DISCHARGE TUBE


  Function
  To show the electric conduction in rarefied gases.
Maker: Unsigned Price: Purchase date:

  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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DISCHARGE TUBE


  Function
  To show the electric conduction in rarefied gases.
Maker: Unsigned Price: Purchase date:

  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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TUBE WITH CROSS


  Function
  To show the rectilinear motion of the electrons.
Maker: Unsigned Price: Purchase date: 1923

  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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RŒNGTEN TUBE


  Function
  To show that the bodies are transparent to x-rays.
Maker: Unsigned Price: L 253.2 Purchase date: 1913

  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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CRYPTOSCOPE


  Function
  To individuate the bodies crossed by x-rays.
Maker: Unsigned Price: L 76.5 Purchase date: 1882

  Description
  It is formed by a fluorescent screen placed on a pyramidal case with handle.

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