For use on pump plate not less than 15 cm dia. Electric bell operating on 4-6 volts AC/DC, suspended on rubber cord in bell jar. Fine coiled wire connection to terminals mounted in rubber bung sealing the jar. They are available in different models like bell in vacuum, glass, bell in vacuum, glass, with buzzer fitted and bell in vacuum, acrylic, size 20 cm x 10 cm.

Dynamometer, push-pull comprises of a steel compression spring mounted on a graduated chrome plated rod and housed in a metal tube. They are fitted with T-shaped handle and are provided with rubber covered top for registering ‘pushes’ and swing aside hook (to register ‘pulls’. The instruments are direct reading being fitted with a scale calibrated in Kg or Newton’s and a cursor registering push / pull reading. Overall length 350mm.

Morse key with sounder are mounted on polished base, with on/off switch for battery and four terminals.

Oersted apparatus with primary of heavy gauge enameled copper wire has an approximate resistance 0.5 ohms wound on former 110 x 30 mm length x diameter. The secondary coil of fine enameled copper wire, approximately resistance 100 ohms on former 120 x 82 mm length x diameter. Both coils fitted with 4 mm sockets. Iron core 160 x 15 mm, length x diameter.

This dual purpose tank is a versatile apparatus allowing all types of waves and wave motion. With illuminator lamp and important accessories included it forms a complete ready to use unit. The unique design and size allows it to be used on an overhead projector as well. Supplied in foam packing and consists of the following components:

• Ripple Tank 40 x 40 cm
• Push Fit legs
• Ripple Motor with eccentric cam, mounted on PVC bar
• Three supports for illuminator and the motor unit
• Motor hanging clamps
• Springs for motor support
• Lamp Unit Halogen 6 Volts
• Hand Stroboscope
• Concave Perspex plate
• Convex Perspex plate
• Rectangular Perspex plate
• Curved reflector
• Barrier Large
• Barrier Small

Tuning fork aluminum have a sturdy streamlined base with provision for horizontal or vertical use. Forks are manufactured from selected steel. Prong is 10 x 25 x 300 mm accurate frequency adjustment, chrome plated, vibrations rate 60 per second. Electromagnet can work on 6 Volts. The amplitude of vibration can vary by sliding the electromagnet inside prongs. Complete with styled, mirror and counterpoise.

Wave motion apparatus Powell's is used for demonstrating the movement of progressive transverse waves. Comprises of small balls fitted on a wire rods, with eccentric motion attachment, with driving handle and fitted on a metal base.

We offer wind vane with bearings mounted on steel pivot. They have a complete metal base.