چكيده لاتين :
In this paper, based on measurements of hemispherical total
emissivity by calorimetric method at very low pressure from
cooling rate of different specimens with different emissivities ,
and gathering experimental information about cooling rate at
atmospheric to 3 x 10-5 torr pressures , a relatively simple
technique with accessible equipment is proposedfor measuring
the hemispherical total emissivity ofplane solid surfaces in the
range 0.05 to 0.98 at temperatures below 1oooe with reasonable
accuracy.
