Comprising a 350 x 210mm rectangle of 22mm glass tubing. Convection currents may be generated by gently using heating one of the lower corners of the rectangle and a small amount of potassium permanganate (VII) crystals dropped into the tubule will act as an indicator. In use the tube is mounted vertically in a retort stand.

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Verifies Coulomb’s Law of the Force Between Charges by Direct Measurement. Suspend one sphere from the top of a box -rest the other on the bottom. Bring them together and the hanging sphere deflects from the other. The apparatus is fully assembled and self-contained. Students precisely measure deflection with an easy-to-read ruler -and so calculate the force. A mirror assures accuracy by eliminating parallax.

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Showing that horizontal and vertical motions are independent of each other. On releasing the catch -one steel ball drops vertically while the other is projected horizontally both hitting the floor at the same time. Consists of a wooden block 190 x 58 x 30 mm approx. with a pivoted L-section spring loaded metal launching bar with a trigger catch. Supplied with 2 steel balls with storage recess in the block.

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Fleming’s Law. Demonstrates that when current passed through a conductor in a magnetic field -it is subjected to a force of attraction or repulsion depending upon direction of current in it. A brass axle with plastic discs is free to roll along rails. Comprises a strong U-shaped magnet and a pair of brass rails with 4mm socket terminals.

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The apparatus consists of a wood compound ring with four pointed strips of metal attached at 90 degrees to each other around the ring. The strips are attached so that their points are in the center of the ring. At the other end of each strip there is an indentation for holding water. Depending on the conductivity of the metal the water will evaporate at different times. Each strip is made of a different metal – aluminium, brass, copper and iron.

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For illustrating an effect of inertia.

When you place the ball on the card and pull back the spring the card (cloth) shoots forward but the ball (dish) drops back to post (table). Actually the ball did move but because it is a ball -it settled into the cup. (The ball has a 5 mm flat spot which permits to stay on the card)

Try the same experiment with a coin. Contains : glass ball, card, plastic base, post hardware instructions.

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Display the interference pattern caused by the reflection of light between two surfaces. A convex lens mounted on top of a flat lens in a metallic frame with three terminals. Ring measures 4″ in diameter and 1-1/2″ thick. When viewed with monochromatic light, it appears as a series of dark and light rings. When viewed with white light, it produces a series of rainbow colored rings.

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Kit for demonstrating wave properties of electromagnetic microwaves. Requires 12V dc supply. Clearly demon-strates reflection, polarization, diffraction, interference for comparison with the behavior of visible light. With in-struction booklet.

Consists of :
battery charging lead
two large aluminium reflectors
one narrow aluminium reflector
black hardboard mirror
polarization grille
microwave transmitter
receiver
audio amplifier and loudspeaker.

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