Do you have that reversed?... Test on the Hiroshima device but no test prior to the Nagasaki device? Fat Man then Little BoyI think it really was right the way I had it: there was no test on the U-235 gun design (Little Boy, dropped on Hiroshima), but the plutonium-based implosion design (Fat Man, dropped on Nagasaki) was tested, at Alamogordo, before actual use in war.
Thank you. Sorry to be a nuisance. I was born the day Hiroshima was hit. Had to use forceps to get me out of the womb! Scary place this.