Johnston and Alvarez 's next task for the Manhattan Project was to develop a set of calibrated microphone/transmitters to be parachuted from an aircraft to measure the strength of the blast wave from the atomic explosion , so as to allow the scientists to calculate the bomb 's energy . He observed the Trinity nuclear test from a B-29 Superfortress that also carried fellow Project Alberta members Harold Agnew and Deak Parsons
Trinity nuclear test
Trinity (nuclear test)
Lawrence H. Johnston