A stepping mechanism consisting of a gear and a spring-loaded lever (pawl) that allows movement in only one direction. A necessary part of a spring-wound mechanism.

The scoring of pins too close together which keeps the damper from operating properly when the cylinder pins strike the dampers in succession.

An organ containing from one to many sets of tuned free reeds. Small reed organs have one manual (keyboard), while larger ones have two manuals and pedals like a pipe organ. See harmonium.

See reed (definition 2).

1. Vibrating metal tongue which produces sound in a harmonium or reed organ. 2. Type of organ pipe: 2a. Free reed: a metal tongue which moves in and out of its aperture (called a shallot) freely as it vibrates. Used in reed organs and harmoniums, organettes, and in certain types of organ pipes, especially those of soft or medium voicing. 2b. Beating reed: a carefully curved (according to principles of voicing) tongue covers the shallot opening (but is too large to enter it) and then springs back again as it vibrates. Mainly used for loudly-voiced pipes.