MORE INFORMATION 
Many names have been given to the Renaissance trombone, including sackbut (literally "push-pull"), saqueboute, shakbusshes, seykebuds, sakbuds, shakebuttes, shagbutts, and even shagbolts. Detailed information about the instrument is given by Praetorius


https://www.music.iastate.edu/antiqua/files/instrument/files/sacbut.mp3



.

MORE INFORMATION
  Who invented the sackbut?                           
 The sackbut was possibly invented by Flemish makers for the French court in the 15th century. Its origins lie in the slide trumpet of the 14th century. The sackbut's name comes from the French "trompette saicqueboute" ("pull-push trumpet"). In the 19th century, the sackbut was known as the trombone.

another photo of sackbut .

SOME VIDEOS OF SACKBUT 

SOME PHOTOS OF SACKBUT 

                                                                                                           

The sackbut is the instrument of the middle  .

A sackbut is a type of trombone from the Renaissance and Baroque eras, characterised by a telescopic slide that is used to vary the length of the tube to change pitch. Unlike the earlier slide trumpet from which it evolved, the sackbut possesses a U-shaped slide, with two parallel sliding tubes, which allows for playing scales in a lower range .                                                                                                                                                                                                                                                                                                                                                                What is the Sackbut made of?                                                Sackbut. Musical instrument, the immediate predecessor of the modern trombone, made of thin, hammered metal, with a shallow, flat mouthpiece and a narrow, nonflaring bell. The instrument produced a soft sound that complemented the harpsichord, voice, viol, lute,recorder, and cornett.                                                                                                                                                                                                                       Where did the Sackbut come from?                                        Sackbut, (from Old French saqueboute: “pull-push”), early trombone, invented in the 15th century, probably in Burgundy. It has thicker walls than the modern trombone, imparting a softer tone, and its bell is narrower. The sackbut answered the need for a lower-pitched trumpet that composers of the time sought.                                                                                                                                                                                                                                                                                 What family is the sackbut in?                                                   The Sackbut belongs to the family of Woodwind instruments. The earliest form of slide trumpet, which afterwards developed into the trombone.