Project C-431-B -- Ball 3-X safety system -- 105-C
Description:
The following is recommended: Initial installation of 39 hoppers of mixed boron steel and ordinary steel balls (80% B steel balls, 20% ordinary steel balls). (The remaining 6 hoppers are to be filled with removable step plugs). Procurement of sufficient balls for possible later installation of 80-20 mixed balls in place of step plugs.
Date:
August 25, 1952
Creator:
Reed, E. L.
Item Type:
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Report
Partner:
UNT Libraries Government Documents Department