Demonstration Perrin Tube. For demonstrating the evidence of the particular nature of cathode rays, establishment of negative sign of charge, the ""electron"" as an atomic particle, concept of ""time-base"", operation of cathode ray oscilloscope, simple Lissajous' figures. The diode gun, tungsten wire ""hairpin"" filament and cylindrical collimating anode, projects narrow beam of cathode rays into the evacuated experimental zone. This beam traverses the sphere to impinge on the luminescent screen in spot about 4mm in diameter. The narrow beam may be deflected in vertical plane to enter the Faraday cage by using Helmholtz Coils. further and horizontal deflection can be obtained using an Auxiliary Coil, thereby constructing simple cathode ray oscilloscope. All connections are made on the Universal Stand.
