This practice keyboard has the serial number 8372 and was built in 1913 by Almon Kincaid Virgil. It has weighted keys and the resistance can be adjusted by turning the brass knob above the center of the keys. No musical tones are produced. These were especially in demand for professional pianists who spent most of their time on a train. Virgil also had a study method book series that was very popular and was written to be used with the Practice Clavier. It was first introduced in 1884 and was made until about 1920.
