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ELECTROSCOPE, PITH BALL on Metal Stand (0314)
A simple device for detecting the presence of electrostatic charges. A plated brass pillar mounted on base supporting two pith balls in un-spun silk.
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PITH BALL, SPARE (0315)
Available as spare for Pith Ball Electroscope in assorted sizes, Pack of 10.
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BUTTERFLY NET, FARADAY (0316)
To show that electrical charge resides on external surfaces of a conductor. Fabric net with cord on insulating pillar with metal base
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GOLD LEAF ELECTROSCOPE (0317)
Rectangular sheet metal case mounted in insulated base and provided with removable front and back sliding glass panels, one clear and other ground, respectively. Removable disc electrode mounted at the top through a moulded plastic bush insulating the disc electrode from the metal body to prevent charge leakage. The plastic bush has a plated metal blade on the underside for fixing the gold leaf. Case fitted with terminal at the side for earthing. Removable clear front slides up to allow insertion of ionizing material in chamber and fixing of leaves, when needed. A clear acrylic circular scale inside the chamber, graduated 0-900, facilitates the comparison of charge by means of deflection. Supplied complete with one pair of leaves.
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ELECTROSCOPE, GOLD LEAF, FLASK TYPE (0318)
Comprises a glass conical flask, sealed at the top with holed rubber stopper. A metal rod supports a disc terminal at the top of rubber stopper and a pair of foil leaves suspended inside.
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ELECTROSCOPE, METAL CASE, BIG (0319)
A bigger sized electroscope, similar to GOLD LEAF ELECTROSCOPE in appearance and construction. It has an insulating bush carrying a metal blade underneath it and inside the chamber to which a single metal leaf maybe pivoted which deflects, when charged. The case provided with a terminal for earthing. The front window is clear and the rear window is of ground glass. An internal transparent scale graduated 0 to 900 is provided for measuring the deflection of the leaf. Includes two interchangeable electrodes that can be fitted on top of insulating bush - a disc electrode of diameter 50mm, mounted on a peg and a metal ball of 25mm diameter to study the charge capacities of both the electrodes. Overall dimensions 112 x 63 x 143mm (width x thickness x height).
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ELECTROSCOPE, IN CIRCULAR METAL CASE (0320)
Annular metal ring frame of diameter about 125mm, carries an insulating bush at the top, which has circular metal disc electrode above it and a conducting metal strip on the underside. The smaller, lightweight metal strip is pivoted at the center of bigger strip to provide deflection with the charging of electrode. The metal frame also has an earthing terminal at one side. Complete assembly mounted on base.
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GOLD LEAVES (0321)
For use with electroscopes, available as spare, pack of 6.
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ELECTROSTATIC KIT (0322)
A comprehensive kit, ideal for a group of students to investigate the concepts of electrostatics. Designed around dual-purpose electroscope, which enables comparative measurements of the weak electrostatic fields apart from the qualitative aspect of electrostatic charges. The complete kit comprises Electroscope with disc electrode and hook electrode - 1 set Metalized Polystyrene Spheres - 4 Nos., Nylon Thread - 1 Reel, Electrophorus - 1 No., Proof Plane - 1 No., Wire Stirrup, for suspending strips - 1 No., Aluminium Cans, 50x25mm [height x diameter) - 2 Nos. Polythene Tiles 75mm square - 2 Nos., Polythene Strip, 150x25mm-1 No., Woolen Cloth, 250mm square - 1 No., Silk Cloth, 250mm square - 1 No., Glass Rod, 10" -1 No.
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FARADAY'S PAILS (0322)
Demonstrates that charge only resides on the outer surface of a hollow conductor with no charge on inner surface. Set consists of 4 nesting aluminium cylindrical containers each fitted with insulating feet. Sizes for each vessel [diameter x height) 150x 120mm, 120x 11 Omm, SOxSOmm, 75x75mm.
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ELECTRICAL WHIRL (0323)
For demonstrating the effect of electric discharge from pointed conductor also called corona discharge. Comprises a series of L-shaped metal spokes with arms bent in same direction, arranged radially in circular fashion and free to rotate on an insulated stand. When brought near a charged object, the pointed end of spokes ionizes the air due to high charge density resulting in its rotation
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Leyden Jar (0324)
For demonstration of the basic principle of capacitance and its use in storage of charge. Comprises an insulated plastic can along with a two metal conducting cans one inside the plastic vessel and the other outside, the dielectric plastic can providing complete insulation between the two metal cans. The inner can has a hook shaped metal rod terminating in a metal sphere at the top for charging I discharging the Leyden jar. The apparatus can be easily disassembled and once charged in assembled condition, retains its charge even after assembly and disassembly.
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WIMSHURST ELECTROSTATIC GENERATOR (0325)
A traditional device capable of generating high electrostatic potentials that can produce spark of length up to 3" under favourable weather conditions. Equipped with two clear acrylic plates, each of diameter about 10" and having aluminium sectors permanently pasted radially along the rim. Both the plates mounted parallel to each other and rotate in opposite direction through a belt-pulley arrangement. Pulley on one wheel has handle for manual rotation. A set of charge collecting combs is mounted towards either end of a horizontal insulating beam, together with the adjustable spark gap arms, the latter equipped with small metallic sphere discharger at one end and long insulating handle adjustment at the other end. The charge can be stored in a pair of high capacity Leyden jar capacitors that can be connected or disconnected as desired. When connected to the Leyden jars through a pair of levers, the spherical dischargers starts accumulating the charge and transfer of charge from one discharger to other takes place in the form electric spark jumping from one sphere to other as a consequence of build-up of sufficiently high potential difference across the two spheres. The spark produced intermittently by the continuously rotating plates. Complete apparatus is mounted on a well insulated base that also carries a pair of earthing terminals for the Leyden jars.
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VAN DE GRAAFF GENERATOR, HAND DRIVEN (0326)
Hand operated. mounted on base. For the generation of electric charge. useful in electrostatics and for studying various phenomena associated with electric charge. Comprises a near spherical dome supported on top of an insulated, clear Perspex pillar on the base. A removable flat rubber belt rotates through rollers mounted at both the ends of Perspex pillar. Lower roller shaft has a pulley driven by a hand operated crank through rubber belt. The continuous rotation of the flat rubber belt results in the accumulation of charge on the dome, until electrical breakdown of air surrounding the sphere occurs. With sufficient charge build up on the dome, bringing the earthed discharge sphere sufficiently close to it results in the transfer of charge from dome to ground in the form of electric spark. Earthing terminal provided on the base. Supplied with discharge sphere, mounted on a long insulated handle
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VAN DE GRAAFF GENERATOR, MOTOR DRIVEN, SMALL (0327)
Useful for electrostatics experiments, where continuous source of high voltage is needed. A motor driven assembly encased in a sturdy metal box made of specially designed two part aluminium extrusion with insulated plastic side supports for safety. The motor driven lower roller rotates the upper roller assembly located on top of the insulated Perspex pipe through a removable flat rubber belt. The continuous rotation of rubber belt results in accumulation of charge on the one piece near spherical metallic dome, charge being transferred continuously from rubber belt through charge collecting combs. Specially designed dome, with smooth and polished surface free of any surface imperfections, and without any sharp corner or edge to minimize charge leakage. The motor operates on AC mains 220-240V, 50/60Hz, fused input through a 3-Core mains cable. Provided with indicator type ON/OFF switch. On bringing earthed discharge sphere, sufficiently close to the charged dome, transfer of charge from dome to the ground takes place in the form of electric spark jumping from dome to the discharge sphere. Under favourable conditions. it can develop electric potential upto 200kV. with a spark of upto 70mm length. 4mm socket terminal provided at the bottom for earthing and another 4mm insert on top of the dome for charge transfer or attaching accessories. Provides for necessary adjustment in all the critical components. Supplied complete with discharge sphere, mounted on a long insulated handle.
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