Caisson
A caisson is:- in engineering, a retaining structure used, for example, to work on the foundations of a bridge pier. These are constructed so that the water can be pumped out so the working environment is dry.
- a carrier of artillery ammunition. The song "The Caissons Go Rolling Along", written during the occupation of the Philippines by the United States of America refers to these; the version adopted as the United States Army's official song has, among other changes, replaced the word caissons with Army.
- a two-wheeled, horse-drawn carriage used to hold and transport the coffin during a military funeral.
- the water-tank wagon used on canal inclined planes
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