Up to eight individual transition peaks can be displayed on the oscilloscope trace used with this unit-clearly showing the quantum jumps in mercury first found by Franck and Hertz.

A metal cabinet houses the tube and oven. Two panels of the cabinet are clear, allowing for visibility of the tube. Another panel has a plainly marked diagram on the outside, showing where to make connections to the tube. A thermometer fits in the top of the oven cabinet.

The set contains a mercury Franck-Hertz tube; an oven with a built-in temperature controller; a control unit; and a shielded cable with BNC connectors. The oven and control box run on 110 VAC, 60Hz line voltage. The apparatus has a temperature range of 150° to 200°C. The tube is heated to about 170°.

Specifications:

Tube:

• 3 electrodes; contains small amount of liquid mercury
• Max. tube acceleration voltage: 70V

Control unit outputs:

• Modes: Manual (for voltmeter) or xy-recorder; ramp for oscilloscope or PC interface
• Franck-Hertz signal: 0-12V
• Accelerating voltage: 0-7V (1/10 of actual for voltmeter)

Controls:

• Set potentiometer for heater voltage, acceleration, reverse bias and amplifier gain
• Power: 110VAC/80W; cord length 1.7m.
• Size: 23.5 x 23 x 17.5cm

Oven:

• Thermostatically controlled temperature, max. 240°C
• Tube permanently mounted in oven
• Power: 110V/450W; cord length 1.7m
• Size: 17 x 19 x 33.5cm