In this case, “caterpillar” refers to the elongated, textured wheel (known as caterpillar tracks, tank treads, or continuous tracks and invented in 1770) seen on the artillery tractor, which allows the easy crossing of difficult land. In some cases, the artillery tractor was built from a modified tank chassis with the superstructure replaced with a compartment for the gun crew or ammunition. These machines allowed armies to supplement light-weight horse-drawn field guns with heavier weaponry. This slide is part of a collection of lantern slides depicting scenes of Australian YMCA war work during World War I.
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