Diameter: 70mm
70mm diameter bench-mounting pulley, made of light alloy, on a brass/silvered-steel bearing held in an alloy bracket with two clamping screws for bench or rod support. 
The bracket may be clamped to a bench edge or similar support of up to 38mm thickness, screwed to a flat surface or held on a 13mm dia. support rod. 

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This Ray box has three openings, two of which can be used simultaneously by two sets of pupils. 
A front opening provides seven grooves for accessories and lenses which have been designed so that when used with a biconvex cylindrical lens of 75 mm focal length, divergent or convergent rays are obtained through the slit plate. 
The two side openings each have two slots for accommodating blanking plates, 50 mm slide accessories. 
Only a minimum of accessories are needed to cover a wide range of optics experiments.
Supplied with a 2 meter with two 4mm plugs, 12V, 24W B15 bulb, bulb holder, slit plate, aluminium blanking plates and instruction manual.
Power supply not inlcuded.

Technical Specifications :
Cable Length: 2 meter
Connection Type: 2x 4mm plugs
Bulb Type: 12V 24W B15 bulb

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This kit is very useful for reflection, refraction and colour mixing experiments. 
The Mirrored Raybox consists of a light source (12V, 24W lamp) producing a convergent, divergent or parallel beam. 
All apertures in the box are provided with vertical channels to hold slit-plates and colour filters.
On one end there is an adjustable cylindrical convex lens (for parallel beam) and a triple aperture system for colour mixing experiments at the other end. (Lateral aperture is provided with adjustable hinged mirror). 

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Accessories for Raybox. 
Pack of 2.

Dimensions:
Length: 84mm 
Width: 50mm 
Thickness: 1mm.

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A single pole changeover reed relay, capable of up to 5 to 400Hz changeovers per second driven by a Power signal generator, enables the repeated charge and discharge of parallel plate capacitors.
Maximum contact ratings 12V 10mA. 
Contact is current protected by a 12 ohm resistor.
Coil operating voltage up to 400 Hz. 

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Resistance units to add to any circuit for basic electrical experiments. 
Instead of using simple resistors these blocks provide convenient connections to a resistance by means of 4mm sockets.

Technical Specifications :
1 Ohm
Max. Volts: 0.7

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This apparatus is used for resonance investigations in air columns and consists of two metal tubes telescoping into each other. 
Fitted on a removable base. 
The column of air within the tubes may be altered in length from 300mm up to 530mm by moving the outer tube. 

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The active material is enclosed in metal foil fixed in a cylindrical mount provided with a stem of 4mm diameter. 
The foil is further protected from accidental damage by a wire gauze cap over the open window’ of the mount.
The nature and strength of each source is clearly engraved on its mount and it is also colour coded for identification. 
5μCi (185 kBq) of Cobalt60 covered by an aluminium disc to shield beta particles so that only gamma radiation is emitted.
Emission: γ
Colour code: Green
Half-life: 5.26 years
Each is supplied in a small lead castle’ in a suitably labelled MDF storage box 100 x 75 x 65mm high. 
A data sheet is enclosed with each.

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