B2B

Tough plastic cased compass with lanyard. Marked with 4 compass points and full 360 degree scale around its edge. Size 45 mm diameter.

The gauss gun (also known as gaussian gun or rifle) is an example of magnetic linear accelerator and uses powerful neodymium magnets to launch steel sphere at high speed. Magnets are held in place part way along the tube (using the steel washers provided), with two steel spheres on the 'downhill' side. Another sphere is rolled slowly towards the magnets and as it gets closer the magnetic attraction causes the sphere to accelerate considerably, resulting in the sphere impacting with the magnets, transferring energy to the sphere at the opposite end of the magnets causing it to shoot off at high speed (similar to how Newton's cradle works). Even faster speeds can be achieved by using series of magnets and spheres. The magnets and steel spheres are contained within clear plastic tube for safety reasons (neodymium magnets are brittle and can splinter, the spheres can be accelerated with some force). Kit includes magnets and steel spheres, washers, a clear plastic tube, a stand for the tube and a brass peg. Instructions for use are also included.

Alnico horseshoe magnet painted red, with keeper. Size 25 mm.

One of the most powerful permanent magnets ever produced. Distance between poles 27 mm. Dimensions (L x H x W): 110 x 103 x 50 mm.

Feel the ultimate pulling power of magnetism with this pair of incredible new Super Magnets. Housed in tough colour coded outer mouldings (red - North, blue - South) the design allows children to safely experience first hand the force of neodymium - currently the world’s strongest permanent magnet! Size 60 mm.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 8 mm depth x 10 mm diameter.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 8 mm depth x 10 mm diameter.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 4 mm depth x 10 mm diameter.

A revised version of the class Whitley Bay Smoke Cell, with LED illumination that runs cool, and will last many years. Using the supplied generator, smoke is introduced to the smoke cell, and the cell is sealed. The lens focuses the light onto a plane within the cell, making single layer of illuminated smoke cells. Observed under a microscope, individual smoke cells can be resolved, and Brownian motion observed. Requires 12 V DC power supply. Suitable microscopes are the Motic SFC-3A range (MI10434 and MI10436) Dimensions: 90 x 46 x 20 mm

Consists of a metal box with a sliding glass front and two detachable glass chimneys. A lighted tea light (night light) is placed beneath the base of one chimney to create convection currents. (Tea lights not supplied). Dimensions (L x H x D): 240 x 90 x 70mm.

Spare chimneys for Convection in Air Apparatus, HE18736.

Consisting of rectangular glass tubing. Dimensions (W x L x Dia.): 210 x 360 x 22mm.

Comprises a capillary tube and thermometer, mounted on a board with a scale behind the capillary tube. The apparatus comes complete with oil in the capillary tube, so no difficult filling with sulfuric acid is required. The relationship between temperature and volume can be observed easily, and an estimate for absolute zero can be obtained through extrapolation of experimental data. Also availabler as class set of 10 in a Gratnells case.

Comprises a capillary tube and thermometer, mounted on a board with a scale behind the capillary tube. The apparatus comes complete with oil in the capillary tube, so no difficult filling with sulfuric acid is required. The relationship between temperature and volume can be observed easily, and an estimate for absolute zero can be obtained through extrapolation of experimental data. Also availabler individually.

The apparatus comprises reservoir with bourdon gauge, connected to vertical glass tube. The reservoir has a needle valve to control pressure, and a high-quality tyre-type valve for attaching the supplied pump. Air does not escape when the pressure is increased, until the needle valve is opened. The pressure is displayed on a bourdon gauge, which has a transparent back, allowing students to see the internal workings. Pressures of up to 3.5x atmospheric pressure can be measured, which provides a good range of measurements. The tube is of strong construction, and is further protected by a plastic safety screen. It has graduations so that the length of the air column can be measured, and is of uniform cross-section, so the volume of air is proportional to the length of the air column. Unlike traditional Boyle's Law apparatus, this unit has no rustable materials, so water can be used instead of oil, which offers superior results, as well as reduced hazard and mess. The water is pumped into the tube, and the pressure and volume of air is measured at regular intervals. The inverse relationship between pressure and volume at constant temperature is easily observed.

This apparatus vividly demonstrates the rise in temperature that occurs when a fixed mass of air in a transparent cylinder is compressed by a hand operated piston. A piece of tinder, which is provided, ignites in the transparent cylinder: much as a diesel engine obtains ignition. The cylinder and piston can also be used to demonstrate the effect of decompression, being the immediate lowering of temperature and the consequent condensation of water vapour inside the cylinder the cloud formed can easily be seen. Cylinder Dimensions: (L) 198.00 mm (OD) 15.00 mm (ID) 9.00 mm

Spare cylinder for Hyman Fire Piston, HE43250.

Spare Tinder for Hyman Fire Piston, HE43250.

This 80 mm diameter hollow metal sphere is connected to manometer (Bourdon) gauge, for demonstrating changes of pressure in closed volume of air when either heated or cooled. Immersing the ball in heated water bath or ice bath allows the relationship between pressure and temperature of the enclosed air to be investigated. The metal sphere is more robust than glass versions and responds to temperature changes little faster.

This simple low-cost apparatus provides means of demonstrating Boyle's law. It is not 100% accurate but it is adequate for demonstrations giving students literally 'feel' for increase in pressure against volume.

A 1 litre capacity round can with screw cap.

To show that the level of liquid in connected vessels is constant irrespective of the vessel size or shape. Consists of four different glass vessels connected by common base tube and mounted on base. Dimensions (L x W xH): 230 x 100 x 160mm.

Hollow metal cylinder with overflow spout. Dimensions (L x Dia.): 100 x 50mm.

For demonstrating how pressure increases with depth. Consisting of a metal cylinder with three identical sized outlets at different levels down one side. Dimensions (H x Dia): 400 x 70mm.

Two-piece set. Brass ring and brass ball mounted in wooden handles. Dimensions (L): 260 mm.

An improvement on the riveted version, this bonded copper and steel bimetallic strip comes mounted in a wooden handle for ease of use. Heating on either side causes the strip to bend as the two metals expand by different amounts. Comes with instructions. Dimensions (L incl. handle): 300mm); Bimetallic Strip (L x W) 200 x 13 mm.

Optical quality rectangular glass block for refractive experiments. Dimensions 114 x 63 x 18 mm (L x W x D).

Rectangular block, 115 x 65 x 18 mm.

Biconvex lens, 75 x 115 x 10 mm (L x radius x D)

Biconcave lens, 75 x 115 x 10 mm (L x radius x D)

Semi-circular block, 75 x 10 mm (Dia x D)

Equilateral Prism, 75 x 10 mm (L of all sides x D)

Set of acrylic blocks including OP11810, OP11815, OP11820, OP11825 and OP11830, pluc a triangular prism.

Acrylic block in the form of shallow S-Shape, ideal for demonstrating total internal reflection. Dimensions 220 x 20 x 20 mm.

The set contains ten 25 mm-thick optical acrylic prisms: - Equilateral triangle 75 mm sides - Equilateral triangle 57 mm sides - Isosceles 90°- 71 mm hypotenuse - Scalene 90° - 78 mm hypotenuse - Rectangle 75 mm x 50 mm - Semicircular 75 mm - Biconvex 75 mm - Biconcave 75 mm - Plano - convex 75 mm - Plano - concave 75 mm

Flexible acetate transmission filter material suitable for making slides for colour mixing experiments or any work involving coloured light. Each set contains sheets: Primary Red, Primary Blue, Primary Green, Magenta, Cyan, Yellow and Neutral Density. The neutral density material gives 50% light transmission with no colour change. Dimensions (L x W): 210 x 148 mm.

Mounted 35 mm slide, red.

Mounted 35 mm slide, green.

Mounted 35 mm slide, blue.

Supplied in A4 sheets in colours red, blue, yellow, green, and orange.

Laminated transparent plastic colour sheets, one each of the primary colours red, blue and green and one each of the secondary colours yellow, cyan and magenta. The sheets are joined at one corner so that different combinations can be overlapped for colour mixing. Dimensions (L x W): 73 x 50 mm.

This Newton's Disc consists of an aluminium plate with coloured segments printed on it. The colours represent the colours of the visible spectrum (red, orange, yellow, green, blue, indigo and violet). When the disc is rotated and the speed increased, the colours start to blur and fuse together and then mix so that the eye, unable to respond rapidly enough, sees this effect as white light. Mounted on base with handle at rear to turn the disc. Weight: 0.8 kg. Dimensions (L x W x H): 250 x 150 x 25 0mm.

This unit contains three coloured light sources (red, green and blue) projected onto screen in overlapping circles. The unit is self-contained, meaning no setup is required, and can be used comfortably by 2-3 pupils at time. The brightness of each light can be controlled independently, allowing any combination of the three. This allows the demonstration of composition of any colour using just the primary colours. Requires 3 x AA batteries.

This motorized Newton's colour wheel is useful for demonstrating that white light is composed of combination of different spectral colours. Comprises a disc with different coloured sectors mounted on low voltage (6V DC) motor box with integral 4 mm sockets. When the disc is rotated at fast enough speed the colours merge to form white (usually off-white). Requires standard variable laboratory power supply (1-6 DC).

An upright case contains three, high powered, accurately colour matched LEDs, each of which has infinitely adjustable brightness. Also supplied is a large, free standing, primary colour shadow mask,a hand held secondary colour mask and a 12 V plug top power supply. The system allows the teacher to project large primary and secondary colour mixing disks onto any vertical surface and to adjust the colour saturation to mix virtually any colour (how do you produce brown). Unlike other systems the purity of the resulting white is outstanding. The unit is extremely easy to use, is easily transportable and comes with full instructions. The only other requirements are a white wall and a darkened/blacked out room. The system may be used to demonstrate both secondary and primary colour mixing, colour shadows and colour reflection/absorption.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Set of gratings 96, 300 and 600 lines/mm mounted on single slide with three 16 x 19 mm apertures. Dimensions 90 x 30 mm.