ELECTRICITY AND MAGNETISM

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 LIQUID-FILLED MAGNETIC COMPASS

 

For reading of topographical and tourist maps and determination of azimuthal location of a given place. Suitable for overhead projector.
Transparent design. Diameter 50mm with black and red magnetised needle. Mounted on a transparent plastic base with 0-6cm x 1mm scale on bevelled end of the base plate. Full circle divided into 360 with N,S,E and W directions indicated. Graduated every 5 and labelled in 60 increments. The needle housing is liquid filled to damp oscillations in just 5 seconds. The red tip indicates north. Meridian lines help in accurate plotting of angles. Adjustable wrist strap. Made in Russia.

Cat. No.

3121-31


 IRON FILINGS

 

For observing magnetic field. Grease free filing in plastic bottles. Pack of 500g.

Type

Cat. No.

Fine

3124-01

Coarse

3124-02


  IRON FILINGS, MAGNETIC CHIPS

Magnetic chips in a 50 gm vial

Cat. No.

3124-00


IRON FILINGS IN TUBE

 

For showing the molecular nature of magnetism. Can be temporarily magnetised by stroking with a magnet and demagnetised by shaking when the filings fall out of line. Consists of a (borosilicate) glass tube 10cm long with a bulb at one end filled with iron filings.

Cat. No.

3125-00


 FRICTION ROD

 

For creating frictional electricity with materials wool, fur for charging electroscopes etc. Approximate dimensions of solid rods are: (l x 250-300 x 10-13mm. Soda glass, solid.

Type

Cat. No.

Soda glass, solid

3128-01

Glass (borosilicate) tubular with one end drawn

3128-02

Plastic solid (bakelite)

3128-03

Ebonite (hard rubber)

3128-04

Polyethylene

3128-05

Sealing wax square, Shellac 200 x 10 x 10mm.

3128-06


 FRICTION PAD (EXCITING PAD)

 

For producing electrostatic charges on friction rods, electrophorous plates etc.

Material

Cat. No.

Cotton Flannel

3129-01

Silk Flannel

3129-02

Wool Flannel

3129-03


 WHIMSHURT MACHINE

 

For generating static electric charges and causing electric discharges. Relative to Van de Graaf it produces higher current with lower voltage.
Consists of two high resistance plastic disks of diameter 25cm approx, with equally spaced metal sectors. The discs are supported in two rigid upright supports, rotating in opposite directions with a hand crank. Provided with a system of induced charge collecting brushes, adjustable ball-ended electrodes and cylindrical Leyden jar capacitors for obtaining higher potential. Produces substantial opposite charges which are deposited in the capacitors and on metal spheres. A rapid sequence of sparks can be generated by lowering the systems capacitance. Mounted on insulated wooden base.

Cat. No.

3131-01


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