Figure 28. Circular disc after thermoforming at 300 F into spherical sector with 

 a 33-inch radius of curvature; note thermocouples embedded in acrylic 

 plastic for measurement of temperature. 



33.000-inch-long arm 

 with dial indicator 



5 5 



Lateral Radius (inches) 



Figure 29. Actual sphericity of the mold for thermoforming sectors with 

 33-inch radius of curvature. 



56 



