Under-hammer

[UNDER-¹ 5 b.] In a pianoforte: (see quot. 1850).

1840.  [see HOPPER¹ 9].

1845.  G. Dodd, Brit. Manuf., IV. 160. The key acts on the ‘grasshopper,’ and the ‘grasshopper’ on the ‘under-hammer.’

1860.  Rimbault, Pianoforte, 396. Under-hammer, a hinged lever … to which the hopper is adjusted; used in upright pianofortes.