CHAPTER II, SECTION 5 Figure 2-120. Station 1341 - Completing Bulkhead and Fill for the shutters of less than one second. The large, rectangular shutter doors of these camera hunkers were subjected to extensive performance testing to insure that (a) they would close within the allowable 0.5 seconds of time. and (b) they would latch securely without rebound. High-speed cameras, and special timing devices were used. Minor adjustments to latches and springs were necessary, as weil as the an- ticipated replacement of lead sill blocks deformed by repeated performance tests. The shutter doors on Stations 1342, 2300 and 2301 were simi- larly tested. The high pressures that would occur and the peculiar arrangement of the structure presented several unprecedented structural problems. And because of the large exposed frontal area and its proximity to ground zero, stability and overturning calculations were iho¥ Figure 2-121. Station. 1341 - Foundation, Formsfor . . RRS . j coe SelaalianeBn. “eos