English: An example of the early use of the slide in a trumpet-like musical instrument. It is found in a miniature from a psalterium executed in the south of France during the 13th century, now preserved in the library of the University of Munich (MS. 24, 4to fol. 96b). The performer is represented playing on a busine in which two of the knobs or rings denoting the joints or sections are shown touching each other. The hand is grasping the instrument just under the lower ring in the act of pushing it up to close the slide, as is indicated by the position of the wrist.