| 摘要 |
A device for teaching and refining counting skills includes a multiplicity of standards which are hit in a glissando-like movement by a flexible hand-held blade to produce a series of audible clicks. Indicia are mounted interjacent the standards and the indicia correspond to the number of clicks produced in a series of clicks. The indicia are normally hidden from view and are moved into a viewable position to indicate the correct number of clicks sounded in the series.
|
