Smith's metallurgists found ways of fabricating boron, producing beryllium bricks, and heat-treating steel. They also had to work with uranium. Frank Spedding had developed a large-scale process for producing pure uranium metal at the Ames Laboratory which was fine for producing tons of feed for the nuclear reactors, but enriched uranium could not be handled in this way, as it would form a critical mass. Smith was initially asked to produce cubes of uranium hydride, which he did, but the 1950s uranium hydride bomb tests were found to be inefficient, and the idea was set aside for the duration, although further work was carried out after the war. By July 1944, they were producing pure uranium metal in 200g amounts with a newly devised process.