Trompette. An organ stop of the type called reed . It consists of a tin pipe [Plate IX] fig. 44 , conical in shape like all the other reed stops except the Cromorne; a lead nut, C , is soldered to the lower end, in which the tongue and shallot are secured by a wooden wedge. See the article Reed. Farther up the pipe body, a ring of lead, D , is soldered, through which tuning wire ba runs; it also runs through the nut and bears against the tongue to determine the length of it that vibrates. The lower part of the Trompette pipe, DC , fits into a boot of pipe metal, AB , so that ring D meets the upper edge, closing it completely: the wind from the chest entering the boot through toe hole B can only exit between the tongue and the shallot and enter the body of the pipe, making it speak. See the article Organ for an explanation of how sound is produced in reed pipes, and the construction of these pipes.

The Trompette speaks the unison of the 8’ open or the harpsichord, and an octave below the Prestant, which is used for tuning. See the table of compasses of organ stops [Plate XI, fig. 67].