This text was prepared by volunteers associated with Heritage-History, using as copytext, War Inventions and How They Were Invented, by Charles R. Gibson, London: Seeley, Service & Co. Limited, 1917.

Since this book was first published before 1923, it is in the public domain in the United States. By U.S. law, it entered the public domain 75 years after its first publication.

There are about a dozen black and white photographs, and also a dozen diagrams included with the text.

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