| D> -Seenipgs i pI I PE 3. A series of eight nuclear test detonations was started in April and will be concluded in June 1952, at the Nevada Proving Ground - Operation TUMBLER to obtain additional information on blast phenomena, and Operation SNAPPER to study new weapon developments. The next series of tests at Nevada is scheduled to be held early in 1953. 4. Construction of new weapons production and storage facilities has continued, We i dla) Weapon Produetion Mark 4 (Implosion-type bomb, outside diameter 60 inches; approximate weight 10,800 pounds} ‘A number of Mark 4 non-nuclear assemblies at each storage site is now maintained in a "ready" condition, fully assembled so they can be loaded in planes without delay. x cgitent sean g Mark 6 (Implosion-type bomb; outside diameter 60 inches; approximate weight 8,500 pounds} 6. Production of the Mark 6 is continuing. ~ Oo - OlAPES IERIDSIEa I

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