APPARATUS             

The apparatus determines Stefan Boltzmann constant. The apparatus consists

of a hemisphere surrounded by hot water. Hot water is obtained from a water-

heating tank. When the blackened disc is inserted at the center of hemisphere,

heat is transferred into the disc from hemisphere by radiation and its temperature

begins to rise, and from temperature raise rate. (It is measured at the intervals of

5 sec.) Stefan Boltzmann constant is determined.

SPECIFICATIONS:

1.  Water heating tank provided with electric immersion heater.

2  .Hemisphere made of copper , 200mm. Surrounded water jacket of 250mm. Dia.

3.  Test disc made of copper 20mm. dia. provided with thermocouple at the center.

4.  Multichannel digital temperature indicator 0-200 C with 0.1C least counts to   

measure the temperature of hemisphere and disc.

5.   Audible buzzer with timer to ring at every 5 seconds.