To show the action of electric current on a magnet. Cobalt steel needle 75 mm, long with agate bearing supported by pivot mounted on plastic base and surrounded by a rectangular of copper rod 85 x 45mm, fitted with terminals.

Low voltage, moulded base with plated contacts and screw connections.

Two brass blocks with 4mm insulated terminals are mounted on a moulded base, an accurately tapered plug with a fluted top fits into the tapered hole between the two blocks, ensuring very low contact resistance.

To study Operational Amplifire Charractersistics and Applications. Consists of 3 d.c. regulated power supplies of 0-5 V Continuously variable, ±15V d.c. regulated power supply, Sine, Square, Triangular wave outputs, one Bread board having two main strips & two distribution strips. Complete with two dual range meters and necessary components.

Bench has two steel rods, one of which is graduated in mms. with heavy metal end supports with levelling screws with four metal slides which slide smoothly on the bench.Two of the slides have transverse motion arrangement. Complete with two lens holders and two object needles.

One metre long, single square steel rod accurately graduated fitted on two sturdy metal feet with levelliing screws. Four special designed heavy sliders having fine index marks. Two of the sliders are having fine transverse slow motion arrangement. Complete with four accessories(two lens holders and tow optical pins).

A wooden base board with one meter scale divided into mms. with following accessories .:
1 each White face object & receiving screens each 150x100 mm,with aperture, mounted on wooden base with an index mark.
1 Plane mirror 150 x 100 mm mounted as above
1 Lens holder V shaped , wooden.
1 Needle vertically mounted in a short wooden rod, on base.
1 Candle holder on base.
The components have the same optical centre height.

A 500 mm diam. disc marked every 5° is mounted on a heavy stand and is rotatable around its centre. It can be held in any desired position. The lamphouse, with a 12V 24 W special filament lamp has rotatable slots to provide light beams of varying widths & also narrow single, double & triple beams. Attached to the lamp house is an adjustable lens carrier with lens to provide diverging, parallel or converging light beams which are clearly visible in classroom. The lamphouse can be held in any desired position around the disc.

Optical elements are two 50 x 25 mm plane glass mirrors, and a metallic cylindrical mirror, each mounted in a holder, for reflection. For refraction, 20 mm thick acrylic semi-circular block, bi-convex lens, bi-concave lens each 140 mm long & a trapezium with 125 mm base are provided. Each of these elements has embedded magnets to hold on to the disc.

Varnished wood, with glass front and membrane suspended on cord for loading with sand to show positions of nodes and antinodes. Overall length 760 mm.

Mounted on transparent base, with 4mm color coded sockets, with circuit diagram printed for demonstration.

To show principle of reflection, with two plane mirrors fixed at 45°, overall size 250 x 45 x 45 mm, polished wood.

Consists of:
8 Plano-convex lens fl 500mm,
1 Plano-convex lens of fl 150mm
12 Lens holders
4 Plates of different apertures,32,22,11 & 5.5mm diam.resp.
3 Plates with small holes in circles of 29,22,10 mm diam.
1 Plate with circular aperture of 5.5 mm diam.
4 Multi-aperture plates
4 Stop plates
2 Slide holders
6 Translucent screens,
10 White cards
4 Eye-pieces
15 each Red,green and blue filters
40 Black cards with holes
40 Razor blades
120 Rubber bands
1 Piece black chiffon for diffraction effects

The kit consists of the following items
8 cardboard boxes 150 x 100 x 100 mm with hole, screen and lid.
50 sheets of black paper 200 x 250 mm.
1 20D W lamp
1 mounted lampholder with flex.
1 packet of pins

A plated brass pillar mounted on bakelite base supporting two pith balls in unspun silk.

Each plate is 125 x 10 cm length x dia of different metals.

For showing the principles of platinum resistance thermonetry and for accurate temperature measurement using a bridge method such as 'Cary-Foster' bridge.

The thermometer comprises a length of fine platinum wire of about 2 ohm resistance, wound non-inductively on a mica frame and soldered to stout copper leads. A pair of compensating leads are provided, all four leads being connected to 4mm socket terminals. Since the connection are soft soldered, this resistance thermometer is suitable for temperatures up to about 150oC only and for low termperature work.

With dial marked with principal points of the compass, one glass face only in plastic/aluminium case. Available in different sizes.

Diam.50 mm. with cover and locking arrangement. Dial marked with points of compass and degrees.

For use as insulators. Length approximate 30 cm. and 13 mm. dia

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.

POWER SUPPLY, Continuously VARIABLE, 25V
Gives continuously variable a.c. and d.c. outputs upto 10 A for a.c. and 8 A for d.c. A meter is provided to indicate both a.c. and d.c. voltages. An internal fuse is provided for input and a resettable cut-out for output. With detachable 1.5 metre mains lead.
Specifications:
Mains Input :220-240 V a.c. 50/60 Hz
Output Voltages :0 to 25 V a.c. and unsmoothened full wave rectified d.c.
Output current :10 A maximum a.c.:
8 A maximum d.c.
Voltage Selection :Rotary continuously variable transformer operated by a large knob on front panel.
Metering:A.c. and d.c. output voltages by a moving coil meter with selector switch to select a.c. or d.c.
Circuit protection :Mains input 3 A internal glass fuselink. Output is protected by a resettable cut-out.
Output terminals :Colour coded 4 mm sockets.

With hooked blade fitted in hard plastic body. Colour: Black, Red

Spherical pattern not adjusted, light blown corning glass, with flat bottom and perforated stopper.

Brass dial head about 40mm dia., divided in 100 parts registering on vertical scale 10-0-10mm, on metal black painted frame. Lead screw and three legs(40mm, separation) are of mild steel, legs are of stainless steel, disc type.

This is a robust instrument designed specifically for student use which nevertheless is capable of very high performance. The main structure is of heavy cast metal, with bright plated fittings. The complete instrument is supplied with wooden case.
Specifications
Scale The 150mm diameter circle with protective plastic shield is fixed to the telescope movement and the table is attached to the double ended vernier which reads to 1 minute of arc. Both telescope and table rotation fine adjustment screws and release of a clamping screws enables adjustment of both movements to be made by hand. Collimator Mounted on fixed and fitted with 178mm. focus achromatic objectives, 25mm clear aperture. Also fitted is a unilaterlly adjustable slit, 7mm long. Telescope Mounted on moveable pillar and fitted with 178mm. Focus achromatic objective, 25mm, clear aperture. Also fitted is a 8x ramsden eyepiece and a glass crossline graticule. Both the telescope and collimator have rack and pinion focussing. Means are provided for levelling the axis of both optical units and for squaring them to axis of rotation. Prism Table The table is marked with lines to assist placing the prism with respect to the table levelling screws. Standard Accessories Supplied 1 prism clamp, 1 diffraction grating holder, 1 magnifier, 1 tommy bar for adjusting optical axis, 1 wooden case.