Tromba Marina - Construction

Construction

The body of the trumpet marine is generally either three sides of wood joined in an elongated triangle shape with a pegbox at the apex; or a body of three to six ribs, a frontal soundboard, and a distinguishable neck. In most cases the bottom end of the instrument is open; some historical models use sound-holes. The single string, generally the D string of a cello, most often is tuned to the C three octaves below middle C. It attaches at the soundboard and passes over one foot of the bridge, leaving the other foot to vibrate freely on a plate of ivory or glass set into the soundboard, creating a brassy buzz. From its curiously irregular shape, the bridge was also known as the shoe; it was thick and high at the one side on which rested the string, and low and narrow at the other which was left loose so that it vibrated against the belly with every movement of the bow. A string called a guidon is tied around the playing string below the bridge and runs up to the pegbox where it is wrapped around a peg. The guidon adjusts the balance of the bridge by pulling the playing string.

The measurements of the tromba marina varied considerably, as did also the shape of the body and the number of strings. An octave string, half the length of the melody string, and even two more, respectively the twelfth and the double octave, not resting on the bridge but acting as sympathetic strings, were sometimes added to improve the timbre by strengthening the pure harmonic tones without increasing the blare due to the action of the bridge.