 The partially assembled Little Boy gun @-@ type nuclear weapon L @-@ 11 was contained inside a 41 @-@ inch ( 100 cm ) x 47 @-@ inch ( 120 cm ) x 138 @-@ inch ( 350 cm ) wooden crate weighing 10 @,@ 000 pounds ( 4 @,@ 500 kg ) that was secured to the deck of the USS Indianapolis . Unlike the six Uranium @-@ 235 target discs , which were later flown to Tinian on three separate aircraft arriving 28 and 29 July , the assembled projectile with the nine Uranium @-@ 235 rings installed was shipped in a single lead @-@ lined steel container weighing 300 pounds ( 140 kg ) that was securely locked to brackets welded to the deck of Captain Charles B. McVay III 's quarters . Both the L @-@ 11 and projectile were dropped off at Tinian on 26 July 1945 . 
