Technical description: Two stopped flue pipes, wood, square cross-section, with tapered round tenons; each with an adjustable leather-covered stopper with a plunger of square cross-section passing through top plates.
Specific usage history: Formerly used in the Laboratory of Experimental Psychology, University of Glasgow.
a. myers, october 1995.
1730 excluding stopper.
Part of the John G. McKendrick Bequest of Auditory Apparatus.; Given by the University of Glasgow per Professor R.W. Pickford.