Figure 22. Same Apparatus as in Figure 21 witli tiie Test Plate Holder Removed. 

 The thermostat and frosted glass plate which rests on shoulders are exposed. The frosted 

 glass permits uniform heat distribution. Refer to question 40. 



Figure 23. Same Apparatus as in Figure 22 with the Frosted Glass Plate Removed, exposing 

 the two dark heat bulbs and the white light bulb. Refer to question 40. 



(21) 



