🔧 Instrument anatomy
Main parts of a jaw harp
Frame, tongue and trigger: what each part does and what to watch for when playing.
Three parts you need to know
For a typical metal jaw harp played against the teeth, begin by distinguishing the frame and its arms, the vibrating tongue and the trigger. The bend between the tongue and trigger redirects the movement produced by a pluck.
1. Frame and frame arms
The rigid frame lets the player hold the instrument securely. Its two parallel sides are the frame arms. On a tooth jaw harp, their front surfaces rest lightly against the slightly parted teeth.
2. Tongue
The flexible metal strip fixed at the root vibrates between the frame arms. Its length, profile, stiffness and mass distribution strongly determine the instrument’s fundamental frequency and response.
3. Trigger
The trigger is the shaped end extending beyond the bend in the tongue. The player sets it in motion with a finger. The pluck should be precise and controlled rather than forceful.
Root, bend and clearance
- Root: the point where the tongue is firmly attached to the frame. A loose or damaged joint reduces response and requires repair.
- Bend: the transition between the straight vibrating section of the tongue and the trigger. Its exact shape varies between makers.
- Clearance: the narrow space between the tongue and the frame arms. It must be even and allow the tongue to pass without touching.
How the parts work together
Plucking the trigger sets the tongue in motion. The narrow clearance between tongue and frame arms turns that motion into periodic changes in air flow and pressure. The mouth and throat then act as a variable formant filter, emphasising different parts of the spectrum and changing the tone colour.
The frame affects mechanical stability, energy loss, comfort and vibration transfer. The fundamental frequency, however, is determined mainly by the properties of the vibrating tongue, not by the frame alone.