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We have not quite done with this. There is another way of referring to pipes, and to complete sets of pipes, which is in familiar use, and is part of the mother-tongue of the organ-builder. We have said that Treble C is often called Foot C. This is because the ordinary open pipe of that note (speaking now quite inexactly, and without precision), is 1 foot in length. In a similar way, CC is 8-foot C, or the 8-foot note, because the open pipe is 8 feet in length, speaking roundly or roughly. Tenor C is 4-foot C; Middle C, 2-foot C.

It will be easily understood that these convenient designations are retained, even though the construction of the pipes may render them strictly inapplicable. Thus, the lowest note of our first stop will still be 8-foot C, though, as we shall soon see, the stopping of the wooden tube enables us to reduce the actual length by one-half. Our CC will still be of 8-feet pitch, or tone, and by no means becomes a 4-foot C, because its actual measurement, when completed, will not exceed 4 feet in total length.