The Applegarth Aérophore, a copper helmet fed by an air pump, already out of date when it was tried at the 1907 siege exercise. When issued in France in 1915 it was mistaken for diving apparatus. From the British 1911 mining manual.
The Applegarth Aérophore, a copper helmet fed by an air pump, already out of date when it was tried at the 1907 siege exercise. When issued in France in 1915 it was mistaken for diving apparatus. From the British 1911 mining manual.