Consists of a robust light box in matt black finish with a 12 V 24 W axial filament lamp with flexible leads. One end of the box takes a cylindrical convex lens in an adjustable sliding mount to enable production of convergent, parallel or divergent beams. The other end of the box has a triple aperture system for colour mixing experiments. The two side apertures are provided with hinged mirrors. All apertures are provided with vertical channels to hold slit plates and/ or colour filters.

• But complete with accessories which consist of:
• 5 Plastic blocks, one rectangular, one semi-circular, one equilateral prism 60x60x60, one right angle prism 90x60x30 and one right angle prism 90x45x45.
• 3 Cylindrical acrylic lenses:one double convex, one double concave, both having the same radius of curvature and one thick convex lens.
• 3 Mirrors, one plane glass, one curved parabolic and one curved semi-circular.
• 2 Slit plates, one with three narrow and one narrow slits, the other with four narrow and one wide slits.
• 1 Set of eight colour filters, red, green, blue, cyan, violet, yellow, orange and magenta.
• 1 Set of coloured cards, red, green, blue, violet, orange, cyan, yellow and pink.
• Complete with one spare lamp, in box.

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%.

Provide a simple means of producing single or multiple rays of light for use in elementary optics. Made of die-cast alloy, the raybox has an open front and vertical internal grooves to accommodate a slit plate and a cylindrical lens. Supplied complete with a metal plate having single and triple slits, a 12 V 24 W SBC line filament lamp and a lampholder.

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.

Chrome plated brass weights, in polished velvet lined wooden case, with hinged lid. Divided compartments with dust proof cover holds nickel-silver and aluminium fractions. With chrome plated brass forceps. Accuracy plus-minus 5mg.

Consists of a robust light box in matt black finish with a 12 V 24 W axial filament lamp with flexible leads. One end of the box takes a cylindrical convex lens in an adjustable sliding mount to enable production of convergent, parallel or divergent beams. The other end of the box has a triple aperture system for colour mixing experiments. The two side apertures are provided with hinged mirrors. All apertures are provided with vertical channels to hold slit plates and/ or colour filters.

• But complete with accessories which consist of:
• 5 Plastic blocks, one rectangular, one semi-circular, one equilateral prism 60x60x60, one right angle prism 90x60x30 and one right angle prism 90x45x45.
• 3 Cylindrical acrylic lenses:one double convex, one double concave, both having the same radius of curvature and one thick convex lens.
• 3 Mirrors, one plane glass, one curved parabolic and one curved semi-circular.
• 2 Slit plates, one with three narrow and one narrow slits, the other with four narrow and one wide slits.
• 1 Set of eight colour filters, red, green, blue, cyan, violet, yellow, orange and magenta.
• 1 Set of coloured cards, red, green, blue, violet, orange, cyan, yellow and pink.
• Complete with one spare lamp, in box.

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%.

Provide a simple means of producing single or multiple rays of light for use in elementary optics. Made of die-cast alloy, the raybox has an open front and vertical internal grooves to accommodate a slit plate and a cylindrical lens. Supplied complete with a metal plate having single and triple slits, a 12 V 24 W SBC line filament lamp and a lampholder.

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.

Chrome plated brass weights, in polished velvet lined wooden case, with hinged lid. Divided compartments with dust proof cover holds nickel-silver and aluminium fractions. With chrome plated brass forceps. Accuracy plus-minus 5mg.