PYRAMIDON
Text: An organ stop of 16 ft. or 32 ft. tone, the pipes of which are closed at the top, and pyramidical in shape, the top being more than four times the width of the mouth. From a pipe only 2 ft. 9 in. in length, 2 ft. 3 in. square at the top, and 8 inches at the block, the note CCC is produced.
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Source: 125