Figure D-2. Equatorial ring and tapered pins needed for attaching the ring to the 

 acrylic plastic capsule. 



The model capsule was fabricated in an identical manner to those 

 already discussed in the main body of the report (Figure D-4), except that 

 10 radially tapered holes were drilled through the wall along the capsule's 

 equator (Figure D-4). For implosion testing, the model was equipped 

 (Figure D-5) with the simplified end closures (Figure 63) described in the 

 main body of the report. 



The test condition for imploding the equatorial ring capsule was 

 short-term pressurization at 100°F. The choice of this test condition was 

 based on the program's need for implosion data on acrylic plastic capsules 

 at various temperatures to establish the temperature-versus-implosion-pressure 

 relationship of acrylic plastic capsules. Since the total number of model cap- 

 sules available for the acrylic plastic hull program was limited, the implosion 

 testing of the equatorial ring capsule had to satisfy two requirements. It 

 had to establish the adequacy of the equatorial ring restraint design while 

 at the same time it had to provide additional data for the study on the 

 effect of temperatures on the implosion pressure of acrylic plastic capsules. 



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