dotted line, D, and opened with the pucellas at E, in which state, when large, it is called a muff; a post, or disk, is then applied at F, that the other end may be sheared, warmed up, and knocked off the post. This forcible knocking-off leaves a rough surface at one end, which is very liable to cut or scratch the hand in cleaning. A machine is sometimes used instead of a post; this machine is usually a sort of spring cradle at the end of an iron rod, which clips the chimney two to three inches from the bottom, avoids the use of the Glass disk, and prevents the ragged edge, but it is apt to ovalize the chimney; it is not, therefore, much used in Glass Factories. (See G.)

The Retort requires much skill in making the weight small in proportion to its size, and needs sharp swinging and extreme care that the bent part between the quill and the body of the neck (D) should not get too contracted, it having at that point always a tendency to collapse while blowing: A is the gathering, while after being well swung and blown, is as B, which is required, while being blown, to be raised in the air, allowing the body, by its gravity, to bend the part D over a bar. On being further blown, it is whetted off at C.