U S Army TRINITY - Nukes Now Seventy-Five Years Old:

At 05.29 on July 16 1945 the United States Army detonated the first ever nuclear device-bomb in the Jornada del Muerto desert New Mexico .. now part of the White Sands Missile Range.

The Trinity Gadget was officially called a Y-1561 Device.

TRINITY GADGET .. about to be armed

with the Tamper Plug close to Lehr's left knee:

Two solid metal half spheres of plutonium-gallium alloy - silver plated - were driven together by two different types of High Explosive to prompt SUPER CRITICALITY.

The two hemispheres together weighed 6.19 kilos (all they had available) and interestingly - the plutonium's radio-activity warmed it up to around 40 C just sitting there.

Going ... At 16 micro seconds

GOING ..

GONE.

Oppenheimer said he named it Trinity from a poem called Hymn to God, my God, in my Sickness ..

As West and East

In all flatt Maps—and I am one—are one,

So death doth touch the Resurrection.

Marty K.