Without using any search engine, What was the name of the third atomic bomb?

[KurtM]

I have a piece of Trinitite that my dad got from the test site back in the early 60s. The nuclear glass formed at the Trinity test site. The first atomic blast in the world. I grew up in New Mexico not far from ground zero.

 

[killerpigeon]

I don't remember the name of it, but I know it took two lives of scientists that where careless.