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" ... To make the whole thing work, soldiers had to hide an array of microphones, connected by electrical wires, across a kilometer (0.62 miles) of battlefield. The microphones were actually repurposed ammunition boxes, each one wrapped in camoflage nettin to block wind noise, with a heated platinum wire stretched across its mouth. The low-frequency booming of the artillery caused vibrations in the air, which subtly cooled the wire and changed how electrical current flowed through it (its resistance, in technical terms), which caused a pulse of change in the electrical signal from the microphone, which would be transmitted through a complex array of wires to a roll of film, where the timing of the pulse would be recorded. Bragg's team owed the microphone design to physicist William Tucker, a University College London lecturer who had joined the Army as a private at the beginning of the war; he received a commission in 1916 and eventually left the Army as a major. ... "