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V-shaped to demonstrate cathode rays extend in straight lines perpendicular to cathode disc.

For quick examination of refractive indices & mean dispersion of liquids, solids and powders.Comprising Abbe double prisms, with thermostat, compensator, telescope mirror and radial arm with vernier. Range nD 1.3000 to nD 1.7000 in steps of 0.001, sugar percentage 0 to 95% in steps of 1 division.

All Charts are made on PVC rexine, hand drawn, waterproof, in fast multicolours with a black background. Each chart is provided with rollers to hang on wall. Size 75×100 cm.

1) Types of Reptiles
2) Snakes Poisonous & Non-poisonous Types
3) Varanus Skull different views
4) Varanus Skeleton
5) Varanus Circulatory System
6) Varanus Excretory System
7) Lizard various systems (Each system on a separate chart)
8) Uromastix various systems (Each system on a separate chart)

All plugs are turned to a fine standard taper and are interchangeable. These are moulded in fluted plastic tops. The brass blocks are undercut and are fitted to a thick insulating plate. Heavy 4 mm brass terminals are used. Coils are non-inductively wound and are treated to be strain-free. Coil values are engraved on the plate and an infinity plug is also included. Accuracy ±0.5% for 0.01 to 0.05 ohm coils, ±1% for the rest.