antinode

Now in the open organ pipe (Fig. 341d), the end of the air column d is a place of great vibration or is an antinode.

The open air column therefore extends from antinode to antinode (or from 1-3) or is one-half a wave length.

The distance from an antinode to a node is that from 1-2 on the curve and is one-fourth a wave length.

Inconsistent hyphenation of word, 'anti-node' and 'antinode' both present in original text.