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BELL SYSTEM TECHNICAL JOURNAL 



0.5 



Tr 



Fig. 79. — A plot of a function used in determining the time required for the tempera- 

 ture of a thermal tuner to rise between two given values when the tuner is cooled by radia- 

 tion alone. The abscissae are given in terms of a reduced temperature. 



1.0 1.1 1.2 1.3 1.4 1.5 1.6 '.7 1 e 1.9 2.0 2.1 2.? 2.3 



Fig. 80.— A plot of a function used in determining the time required for the lcmj)era- 

 ture of a thermal tuner to fall between two given values when cooled by radiation alone. 

 The abscissae are given in terms of a reduced temperature. 



