Toward the end of the 19th century mechanical devices began to proliferate on zithers. Most of them were short lived, if marketed at all, but a few came into persistent use. One of their purposes was to enable a sequence of strings tuned diatonically in a given key to be shifted into others. Although this can obviously be effected simply by retuning the strings, for example, altering a G major scale to D major by raising all C strings to C♯, rapid changes require a more nimble auxiliary device.

Corresponding mechanisms were applied to chordal string arrangements, altering a block of strings from one type of chord to another. This was illustrated in the preceding post with a Swedish harp zither patented in 1886 by Adolf Larsson, equipped with a mechanism for shifting each supported major chord to the parallel minor or a seventh. This post’s banner image comes from a German patent (no. 266371) for an improvement on that device, issued to Larsson in 1913. A more recent two-position design is demonstrated here.