“ TUNING FORK, a small bar of cast steel with tolerably defined edges, bent into a fork with two prongs, with a handle of the same metal extending from the bend of the fork and serving as a sound-post to transmit the vibrations to any resonance board or body convenient for reinforcing the sound. The fork is set in vibration by striking one of the prongs against a hard substance, or pressing the prongs together if they are light ones, or if heavy drawing a bow across. ”