Teltron Demonstration

The Fine Beam Tube is for examining the deflection of electron beams in a uniform magnetic field using a pair of Helmholtz coils and for the quantitative determination of the specific charge of the electron. The gas atoms are ionized along the electron path and produce a sharply defined, visible fluorescent beam. The tube is mounted on a base with color coded electric connections. The evacuated glass tube is integrated with an electron beam system consisting of:

→ An indirectly heated oxide cathode
→ A Wehnelt cylinder and a perforated anode
→ Residual gas atmosphere with set gas pressure
→ Integrated measurement marks for parallax-free measurements

For showing the linear propagation of cathode rays magnetic reflection of cathode rays ,image distortion due to electrostatic charging ,Comprising of cathodic stream and electromagnetic radiation and an introduction to electron optics using a single Helmholts coil. The tube comprises the standard spherical glass body with the cylindrical neck, a diode electron gun with a filament and cylindrical anode connected to 4mm sockets in the plastic cap a metel maltese cross mounted in the center of the sphere connected via 4mm plug in one of the side caps and phosphor coated screen.
→ Maximum filament voltage 7.5V
→ Anode Voltage 2000 to 5000V
→ Anode current at 4000V is 1.8mA

For determining e/m by balanced electrostatic deflection s or by magnetic deflection using the Halmholtz coils. simple electrostatics and magnetic deflection may be demonstrated and the relationships shown between the plate potentials or coil currents and the degree of deflection. The electron mirror effect producing trochodial spirals is easily shown and also the magnetic focusing at point along the trochoid.
→ Maximum filament voltage 7.5V
→ Anode Voltage 1500 to 5000V
→ Anode current 1mA
→ typical Operation 2000 to 4500V

Helium filled electron beams may be observed throughout the full length of their travel within the tube. a green glove being emitted during the Gas electron collisions. The tangential beam can be deflected by use of Halmholtez coil to produce a completely circular path permitting e/m measurements to be made .Clear free path studies may be made and phenomena such as screen blanking due to charge build up on the screen may be observed .within the tube one gun pointing along axis of the tube ,while the other is cylindrical cap. The angle of projection from from the gun is adjustable by means of miniature deflection plate near the gun outlets, a small potential being applied via 4mm connection at the side of the cylindrical neck. The end of the body has a phosphor coated screen for use with the axial gun.
→ Anode Voltage 0 to 300 V d.c
→ Anode current 10 to 20mA
→ Heated Voltage 6.3V at 0.3A
→ Deflector Voltage 0 to 25V d.c

Designed to accommodate the whole range of Teltron tubes and accessories. The base 240x180x50mm,and vertical arm of the stand 280mm high are cast in light alloy and stove enamelled.Three rubber feet ensure maximum stability .The tube mounting jaws are provided ,moulded in a material with very high electrical insulation properties. The jaw are split lengthways to admit the side caps of the tubes. and clamps sliding on the jaw locks them securely in position. The jaw 160mm longx140mm separation have an integral hollow boss which is secured in the stand by a rubber O ring at the center height of 263mm,permitting a full 360° rotation so that the tube may be displayed to the best advantage. Sockets in the base accommodate the Helmholtz coil supports and locate the coils accurately either side of the tubes. A 4mm earthling socket is drilled in to the piller base.

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