A metal or brass tube will serve as such a pipe, and may be excited by a suitable tuning-fork held at one end.
The only official standard is the French, dating from 1859, preserved by a tuning-fork vibrating 870.9 (double vib.
1762 Pascal Taskin's tuning-fork, Paris..
1714 Seville Cathedral.1785-1790Old English tuning-fork' c. 1715 Imperial Russian Court Church Band..
1860 Stein's tuning-fork, Vienna 1780 Handel's tuning-fork.