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TUNNING FORK ON RESONANCE BOX (0617)
For demonstrating the formation of basic major cord. Comprises four tuning forks mounted on a single wooden box in a line at the top and having frequencies (Hz) of C1(256), E(32O), G(384), C2(512). Supplied with hammer.
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PAIR OF TUNING FORKS ON RESONANCE BOXES (0618)
For exploring the concept of resonance through sympathetic and forced vibrations, and phenomenon of beats. Comprises two matched nickel plated tuning forks of frequency A(426.6), each mounted on top of hollow wooden box open at one end. One fork is provided with a sliding mass on one prong by means of which its frequency can be varied from the nominal 426.6Hz. When both forks are sounded a clearly audible 'beat' is produced, its rate depending upon the difference in frequency between the forks.
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TUNING FORK, STANDING (0619)
Lightweight tuning forks, capable of standing upright, with specially wide sound irradiating surface, useful for exciting oscillations for the Kundt's tube.
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TUNING FORK, ELECTRICALLY MAINTAINED (0620)
For producing vibrations in the stretched strings. Comprises a thick sturdy steel tuning fork with its stem held securely in cast metal clamp, which in turn is mounted on a sturdy, streamlined, heavy cast metal base with provision for horizontal or vertical use. An electromagnet operating on 6V is positioned between both the prongs and can slide along the prong's length for adjusting the amplitude of vibration of prongs. End of both the prongs have a stylus for frequency measurement and threaded arrangement for Melde's experiment.
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MELDE'S APPARATUS (0621)
For showing the effects of vibrations in a stretched cord and investigate the relationship between frequency, tension and density. In addition, the provision of electrical contacts, opened and closed by the vibrating armature, allow the apparatus to be used as high-speed changeover switch in. Comprises a thin steel rod armature mounted in a clamp formed by a pair of 4mm socket terminals, so that its free length may be adjusted as desired. An AC energizing coil surrounds the armature and a permanent magnet provides the necessary magnetic polarization. The free end of the armature equipped with a small boss and clamping screw for attachment of the cord and also serves as the moving contact when the apparatus is operating as a changeover switch. The complete apparatus is carried upon a box type base.
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STETHOSCOPE (0622)
Good quality, with rubber tubing. Highly sensitive. Useful for observing faint sounds and vibrations after due amplification.
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ORGAN PIPE, SIMPLE (0623)
For demonstrating the relationship between length of air column and frequency of sound produced. A square pipe of polished wood, open, tuned to C1(256), overall length about 760mm.
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ORGAN PIPE, WITH GLASS FRONT (0624)
Similar to ORGAN PIPE, SIMPLE but with varnished wood pipe, having glass front and membrane suspended on cord for loading with sand to show positions of nodes and anti nodes. Overall length about 760mm.
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ORGAN PIPE, WITH PISTON (0625)
Stoppered, varnished wood with movable piston marked with the chromatic scale from C (512) to (1024). Overall length when fully extended is about 840mm. Can also be used for investigating the phenomenon of beats in conjunction with a second pipe of the same type.
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SAVART'S TOOTHED WHEEL (0626)
Four toothed wheel each of diameter 7.5cm and spaced 6mm apart on a shaft with projecting spindle with slight taper at its end. For use with whirling table.
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WHIRLING TABLE (0627)
For demonstrating the various effects associated with the rotation of accessories mounted on it. Cast metal body, stands overall height about 43cm and can be used in both vertical as well as horizontal position. A cast metal adjustable driving wheel fitted towards the lower end of the stand drives a small pulley near the top through a belt. The driven pulley
carries a spindle with socket for taking various accessories. Suitable
for use with Savart's Toothed wheel and disc and an adapter to accommodate colour discs.
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HAND STROBOSCOPE (0628)
Simple model, hand driven to show the student stroboscope effects. A circular black disc having radial slots extending to the edge of the disc. Ball
bearing mount at the center minimizes friction. With handle for rotation.
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RIPPLE TANK CONTROLLER (0629)
The unit provides two fully independent continuosly variable DC outputs, 0 to 5V each through a pair of color coded 4mm sockets, for the ripple tank motor and a stroboscope motor respectively, along with a fixed AC output through a pair of 4mm sockets, rated at 12V, 21 W to operate the illuminant. the motor outputs are short ciruit proctected and the input to complete the unit is fuse rotected. Supplied with a detachable 1.5m mains lead.
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RIPPLE TANK APPARATUS (0630)
A specially designed versatile apparatus for the investigation of the wave properties, such as wave propagation, reflection, refraction, diffraction and interference. Permits demonstration with an overhead projector or use as a free standing bench model, allowing investigations to be carried out directly. Comprises a rectangular plastic tank with clear bottom and sloped sides incorporating beach effect to eliminate unwanted reflections. The tank has four detachable legs mounted at its underside at the corners with a hole in the clear tray for water drainage. One end of the tank has clamps for supporting lamp holder with a pair of clamps on each side for mounting rippler support rods. Rippler assembly comprises of a rectangular plastic rod with series of holes suitable for mounting spherical dippers and a low voltage DC motor having eccentric cam attached to its shaft to produce oscillatory motion. Supplied complete with following accessories. - IIluminant Assembly, ? Set of 4 barriers - a pair of bigger L-shaped (75 x 25mm) and a pair of smaller L-shaped barrier (25 x 25mm) 1 Curved Barrier, 2. 5cm high, with uniform radius of curvature, ? 1 Hand Stroboscope, 1 Convex Lens, 1 Concave Lens, 1 Rectangular Block, ? 2 Spherical Dippers, Spare Elastic Cords for suspending rippler assembly.
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ACCESSORIES FOR RIPPLE TANK Trapezoidal shaped disc - for showing refraction of waves. (0631)
These accessories available optionally, permits more advanced activities with the ripple tank.
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