While defense budgets were small in the 1920's and 1930's the US Army experimented with and developed many new technologies so that when war came in 1941 the Army could provide the troops with modern, functional, reliable equipment.
Here a new cannon is being tested.
Live fire on the range is essential for proper testing, you can only do so much in the laboratory.
The control panel is hooked up to the gun to measure pressure, velocity and to initiate firing.
Technical experts man the board.
It's a big day for the Army when a new gun is tested.
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