The dulcian is a Renaissance woodwind instrument, with a double reed and a folded conical bore. Equivalent terms include English: curtal, German: Dulzian, French: douçaine, Dutch: dulciaan, Italian: dulciana, Spanish: bajón, and Portuguese: baixão.

The name dulcian (also dulzian, dulzian, dolzone, delzan, dulcan, dolcan) is from the Latin dulcis (sweet). This instrument was also called the curtal (or curtoll, curtail) from the Latin curtus (short).

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The dulcian is a double-reed instrument with a folded conical bore that doubles back on itself by way of a tight U-shaped turn at its bottom end. It is constructed from a single shaft (with an oval cross-section) of wood (often maple) with two parallel bores …

The Dulcian is the predecessor of the modern bassoon. It differs from early bassoons in two key respects: the number of its constituent parts, and the shape of its bell. The dulcian is made of a single piece of wood, where as early bassoons are made from four pieces of wood.

May 15, 2003 · There are 16 examples of Doucaine, all at 16' pitch except for one at 32' pitch, and one each at 8' and 4', borrowed from a 16' rank. The only known example of Dolciana is a flue. There are 40 examples of Dulciane, but only two are …

The distinguishing feature of the dulcian is its conical double bore (fig. 1): a smaller, smoothly tapered downbore, started from one end of the workpiece, and a broader upbore, started from the other end and ending into the bell.

The dulcian is a Renaissance-era woodwind instrument, recognized as the direct predecessor to the modern bassoon. Its rich, reedy timbre and versatility made it a staple in both secular and sacred music from the mid-16th to the early 18th centuries.

The curtal or Dulzian (often rendered in English as dulcian) seems to be the first woodwind instrument to be double-bored, that is, to have its trunk of wood bored through in two places with a connection at the bottom so that the tube doubles back on itself.

The name dulcian (from the Latin dulcis = "soft, sweet," referring to the instrument's more subdued tone quality) is commonly used for the original version of the instrument in one piece, as opposed to the later type in joints, called bassoon.