Comprising a heavy-gauge copper outer vessel with an internal perforated shelf for copper sulphate crystals, a porous pot and an amalgamated zinc rod fitted with a wooden supporting cap. The zinc rod and copper vessel are each provided with a 4 mm. socketed terminal.

• In this cell E = 1.08 V approx.

• Working capacity 0.85 litre

• Size of copper vessel : 130 x 90 mm diameter approx.

• Size of porous pot : 150 x 150 mm diameter approx.

• Size of zinc rod : 150 x 12 mm diameter approx.

A: With detachable 'snap-on bakelite cover, metal thread terminals, silver contacts. Dome gang dia. 75 mm approx. For use on 3 to 4.5V AC/DC supplies.

B: As above, but works on 230 Volts AC/DC, 50-60 Hz.

• A weather vane made of sturdy plastic or metal.

• The large arrow is free to rotate and will come to rest pointing to the wind direction.

• It can be held or fixed to a post.

• Height : 30cm (minimum)

• One set is composed of 2 pcs.

The motor is mounted on a base with a driving wheel.Output is through 4 mm sockets and a low voltage bulb is also provided as a simple output indicator.

A very effective and motivating learning aid in elementary electromagnetism. Consists of 8 anisotropic alloy magnets, 8 ceramic ferrite magnets, 4 steel magnet yokes, 6 plotting compasses, 4 hardboard formers to take compasses, 1 bottle iron filings 250 gm, 4 dispensers for iron filings ,4 double C-cores, 4 clips for C-cores,4 aluminium rings,4 aluminium split rings,4 armatures with axle tubes,4 aluminium axle rods, 8 split pins, 16 rivets, 4 formers for coils, 4 reels cellotape,4 reels copper wire, 4 sheets white pasteboard,4 plain postcards,4 reels white cotton thread, 1 length latex rubber tubing, 4 each resistors 100 ohms and 10 ohms,4 support bases,10 m.e.s.bulbs, 8 mes bulb holders,1 wood clamp, 1 wooden block, with instructions.

For Westminster Electromagnetic Kit giving 1 V full wave rectified d.c. and 1 and 2 V.a.c. outputs at 8 A max. The circuit diagram is printed on the top panel which also carries mains switch,light indicator and output sockets for d.c. and a.c. With 1.5 metre mains detachable cable.

Consisting of primary coil of insulated copper wire wound upon cylinder with terminals, secondary coil wound upon cylinder into which primary fits. A soft iron core fits the cylinder of the primary. Complete with terminals.

Electronic solid state induction coil, but without vibrator, fitted with reversing switch, operated on 220V A.C. + 15%.

Spark in mm : 25, 50, 75, 100

With primary of heavy gauge enamelled copper wire, approximate resistance 0.5 ohms wound on former 110 x 30 mm length x diameter. Secondary coil of fine enamelled copper wire, approximately resistance 100 ohms on former 110 x 82 mm length x diameter. Both coils fitted with 4 mm sockets. Iron core 120 x 15 mm length x diameter.

A: Charged porous pot 150 x 60 mm height x diameter, with brass terminal, having e.m.f. 1.5 volts and zinc rod 12.5 mm diameter in rectangular polythene jar.

B: As above, but in glass jar.

A: Plug type, in polished teak wood box with hinged lid and black bakelite panel lined in white colour to show circuit connections. Coils of constantan wire double sild covered are wound non-inductively and have a negligible temperature co-efficient. Three pairs of ratio arms are each 10, 100, 1000 ohms and resistance arms contains 16 coils from 1 to 5000 ohms with infinity plug. Total value 11,110 ohms. Two spring keys having special contact for battery and galvanometer fitted. Accuracy of coils 100 to 500 ohms + 0.05% and of the rest coils + 0.1%.

B: Same as above, with four pairs of ratio arms are each 1, 10, 100, 1000 ohms. Above are available with coils made of MANGANIN WIRE at extra cost.

Decade Dial type, with 6 decade (two decade having 4 ratio arms 1, 10, 100 and 1000 ohms and decade resistance units, total resistance 11110 ohms). Coils of constantan wire double silk covered are wound non-inductively. It is fitted with two enclosed tapping keys for battery and galvanometer. Accuracy + 0.01% of unit coils.

Above is available with coils made of MANGANIN WIRE at extra cost.

A one metre long single resistance wire passes over a metre scale and is firmly clamped to stout brass end-plates,on wooden base.Complete with knife-edge jockey. Available in 2 and 4 wires also.

Also available in 2 and 4 wires also.

A: In bakelite case with 4mm socket and captive head terminals. Bobbins non-inductively wound with double silk covered constantine wire.

B: Non-inductively wound with double silk covered constantan coils on plastic rod enclosed in transparent plastic tube with two terminal and values figured. Accuracy + 0.2%. Rating 1 watt. Individually packed, available in different ohms.

For accurate work, in polished teak wood box and bakelite panel figured in white. Split brass contact blocks hold precision cut, interchangeable plug having moulded black bakelite fluted tops. Coils of constantine wire, double silk covered are wound co-efficient. Coils are connected with double nut system. Accuracy +, available in different ohms.

For use as series resistors or potentiometers. Open type slide wire type with a variety of resistance and current carrying capacity. Copper-nickel alloys wire is oxidised to provide perfect insulation. Phosphor bronze contact provided on metal chrome plated slider-rod to give rapid and smooth adjustment. Three 4 mm socket terminals are provided. One at each end of the wire and the third at one end of the slider-rod thus the Rheostat can be used as potentiometer also. Resistance in ohms and current carrying capacities are engraved on it. The end support are made of metal/bakelite. Diameter 43 mm.

Glass jars 15 x 10 cm. length x dia. Complete with zinc and copper plates.