wrest plank การใช้

The wrest planks and bridge are made from hard woods such as birch.
Silbermann also copied another ingenious Cristofori invention, the inverted wrest plank ( see Bartolomeo Cristofori for the function of this device ).
The roses used by all members of the Ruckers family show an angel playing a harp, with the initials of the builder on each side of it; the date was found either on the soundboard or the wrest plank.
These instruments exist in two main types :'Standard Prima'instruments and'concert'instruments, which differ from the'Prima'instruments in that they have a re-tuning mechanism placed in the upper wrest plank of the instrument.
Chickering patented single piece iron frames combined with wrest plank bridges and damper guides in square pianos, and with massive wrest plank terminations in grands; Chickering & Mackays were assignees of an action patented by Alpheus Babcock, and licensed actions patented by Edwin Brown and George Howe.