Grayed Demos are either not available or haven't been built yet.

PIRA #

Demonstration Name

Abstract

5M10.10

Hall voltage

Measure the transverse potential of a large rectangle of biased N-doped germanium in a magnetic field.

5M10.10

Hall effect

The transverse potential of a large rectangle of biased N-doped germanium is measured when inserted into a magnetic field.

5M10.10

Hall voltage

Current is passed through a N doped germanium crystal while in a strong magnetic field and the voltage at the sides is monitored.

5M10.10

Hall effect

Measure a voltage difference in a germanium sample perpendicular to the current flow when placed in a magnetic field. Picture Diagram, Construction details in appendix, p.1367.

5M10.10

Hall effect

A Hall effect probe in a magnet, animation.

5M10.11

Hall effect magnet

Apparatus Drawings Project No. 12: A small electromagnet for use with an indium-antimonide device.

5M10.12

Lorentz force on conduction electron

A voltage is induced on a moving metal in a magnetic field.

5M10.15

an electron in a periodic potential

The interaction of an electron with a crystal periodic potential is demonstrated with an air track cart mounted magnet moving past a magnet array.

5M10.19

model of a semiconductor

A model made of pegboard and balls that shows a hole moving along a preselected path.

5M10.20

hot point probe

A hot point probe consisting of a soldering iron and a microammeter tests for the two types of conductivity.

5M10.30

color centers

Electrons or holes are injected into a large transparent alkali halide crystal in an oven resulting in the formation of color centers. Pictures, Diagrams, References: AJP 25,5 ,306.

5M10.32

color centers

Injection of electrons into a transparent potassium chloride crystal at high temperatures results in the formation of color centers. Pictures.

5M10.34

Shockley-Haynes experiment

A difficult but worthwhile demonstration illustrates diffusion and drift phenomena.

5M10.40

Josephson weak link model

A rigid pendulum and aluminum disc are mounted on a shaft driven by a weight hanging on a thread wrapped around the shaft and damped by eddy currents.

5M10.50

diode

Positive and negative voltages are applied to a lamp in series with a diode.

5M10.60

PN junction

Demonstrate a PN junction with a battery.

5M10.61

transistor curve tracer

Circuits for constructing instruments to display transistor curves on an oscilloscope.

5M10.62

Fermi level model

A model with ball bearings representing electrons and holes in Plexiglas representing states.

5M10.70

brillouin

View a waveform on an oscilloscope through a cardboard with slots cut out.

5M10.71

brillouin/compass array

5M10.90

transistor amplifier

5M10.90

transistor amplifier

A transistor circuit board shows simple amplification.

5M10.92

integrated circuits

Show transistors and integrated circuits including slides of integrated circuit blow ups.

PIRA #

Demonstration Name

Abstract

5M20.10

glow discharge

Various discharge phenomena are described from atmospheric to high vacuum.

5M20.10

glow-discharge tube

The pressure is reduced on a large tube while high voltage dc is applied to the electrodes.

5M20.10

gaseous discharge tube

Pump down a long discharge tube to show Crookes' dark space, negative glow, Faraday dark space, striations, etc.

5M20.12

potential required for glow discharg

Show the minimum voltage for a neon glow tube to discharge.

5M20.15

thermionic effect

Use a tube to show the thermionic effect in a vacuum.

5M20.20

special-purpose discharge tubes

Gas discharge tubes for spectra, fluorescence of minerals, line tubes, paddle wheel, etc. are mentioned.

5M20.20

five cathode ray tubes

Special tubes that demonstrate five properties of cathode rays.

5M20.25

electron beams

A tube with a replaceable lime spot (or barium, strontium, and calcium oxides) hot cathode gives a brilliant beam. Diagram.

5M20.28

electron focusing

Three types of focusing of the beam: residual gas, electrostatic, and magnetic.

5M20.30

gas filled tubes - two element type

A circuit for demonstrating the mercury-vapor rectifier tube.

5M20.31

hot-cathode discharges

The Tungar rectifier bulb and the phanotron mercury-vapor rectifier illustrate the role of cathode emission in discharge.

5M20.32

diode tubes

The Welch demonstration power supply board is used to explain the theory of the diode tube.

5M20.35

thyratron tube

The function of the grid in a discharge tube is shown with a thyratron.

5M20.36

gas filled tubes - grid controlled

A circuit for demonstrating the thyratron tube.

5M20.40

three element tube curves

A circuit for obtaining the characteristic curves of a triode.

5M20.41

"fresh air three electrode tube"

Elements of a three electrode tube are placed in a bell jar.

5M20.42

three electrode tube model

Steel balls represent electrons in a mechanical model of a triode. Picture.

5M20.43

three element tube - electrostatic

A circuit for controlling the plate current of a three or four element tube.

5M20.44

the triode

A circuit for demonstration the principles of a triode tube. Reference: AJP 23(9),384.

5M20.46

triode demonstrator unit

Apparatus review of the Modern and Classical Instruments triode demonstrator board. (1961)

5M20.50

soap bubble model of tubes

Soap bubbles moving through plates connected to a Van de Graaff generator simulate behavior of electron tubes. Picture.