clapper 的詞源

13世紀晚期，"發出響亮、尖銳的聲音的東西"，這是從 clap (v.)派生出的名詞。"鍾舌"的含義始於14世紀晚期。古英語中有 clipur。"在開始拍攝電影時，用於同步畫面和聲音的鏡頭前方的鉸接板"的含義始於1940年。

Clappering.—It is still necessary to warn clergymen and churchwardens against allowing the lazy and pernicious practice of 'clappering,' i.e. tying the bell-rope to the clapper, and pulling it instead of the bell. More bells have been cracked in that way than by all other causes together, and there is not the least excuse for it .... [Sir Edmund Beckett, "A Rudimentary Treatise on Clocks and Watches and Bells," London, 1883]

敲擊。—仍然有必要警告牧師和教堂管理員，不要允許那種懶散和有害的'敲擊'習慣，即 i.e. 將鈴繩系在鈴舌上，而不是拉鈴。這種方式導致的鈴聲裂紋比所有其他原因加起來還要多，對此沒有任何藉口.... [埃德蒙·貝克特爵士，《鐘錶和鐘的初級論文》，倫敦，1883年]