An insulating powder that is contained in a hollow formed by two concentric spheres makes up the equipment. The mica heater is located inside the inner sphere. The dimmerstat allows you to modify the heater's input. The temperature differential between the spheres is determined by tapping on the surfaces of the inner and outer spheres. This makes it possible to determine a powder's conductivity.

Specifications:

• Inner sphere dia. 100mm and outer sphere dia. 200mm.
• Mica heater two heat the inner sphere surface.
• Ten thermocouple tappings in the test section.
• Plaster of Paris / asbestos powder in the test section.
• Panel comprises of

  a)Voltmeter and ammeter

  b)Dimmerstat

  c)Temperature indicator

Services required:

• 220v stabilized single-phase supply.
• Floor surface 1m x 0.5m at working height.