Orchestras commonly use the French horn for its warm, mellow tone. The French horn has 16 feet of brass tubing, which is twisted and ends in a wide bell. When this instrument was first produced crooks created a change in tone by altering the length of the tube. Crooks are extentions of the tube. In 1754, Joseph Hampel invented stopping which is a method that the player would change the tone by placing his or her hand into the bell. In 1800’s, three or four pistons were added for a smoother change in pitch.