(Didactic Division)

Electrical

Rheostats

For use as series resistors or potentiometers. Open type slide wire type with a variety of resistance and current carrying capacity. Copper-nickle alloy wire is oxidised to provide perfect insulation. Three 4mm. socket terminals are provided. Supports are made of metal/bakelite. Diameter 43 mm.

Rheostats Single

With protected cover, newly designed, wounded with heavily oxidised resistance wire upon a tube. Fitted with 4 mm. safety socket terminals. Resistance + 10% compared to nominal value.
Resistance Ohms
10
10
33
33
100
100
330
330
1000
1000
Current Amp.
4
5.6
2.2
3.1
1.25
1.75
0.7
0.95
0.4
0.5

Wheat Stone Bridge, One Meter

This substantial bridge has broad, heavily plated brass strips mounted on polished hardwood base. Terminals with 4 mm. sockets are provided. The 24 SWG constantan wire is stretched along the top of a meter scale in mm. and cm. Supplied WITH JOCKEY. Dimensions 1.13 mm x 80 mm x 50 mm approx. Wheatstone Bridge, Two - Gap Wheatstone Bridge, Four - Gap

Jockey

Sodium Lamp with Power Supply

Solar Cell Unit

With motor, unit capable of rotating a small propellor, mounted on mini motor to explain conversion of solar energy into mechanical energy.

Mounted Motor for Solar Cell

This is a small low consumption electric motor on a base specially designed to run directly from the output of the solar cell and to illustrate the direct conversion of light energy to electrical and hence to mechanical. The motor spindle carries a simple pulley, 16 mm. diameter, and is capable of raising a mass of at least 4g. when powered by the solar cell.

Photo Electric Cell Unit

Mounted on base, colour coded sockets, with circuit diagram printed for demonstration.

Photo Gates & Timer

These pair of photo gates is housed in tough moulded cases giving them excellent durability. The lamps operate on 6Volts with a special built in circuitry which prevents lamps from damage in case higher voltage is applied accidently. The photo gates can be connected by 4 mm. sockets to a timer and power supplies.

Electric Whirl

For demonstrating the effect of electric discharge from points. The apparatus has a 60mm diameter, Three-pointed star wheel with all the points curved in one direction. The wheel rotates freely on a pivot point mounted on a short stand and the stand is provided with a 4mm connection socket on its round moulded base.