The first operation in producing the piano is to make a wooden frame
or back on which is attached first the sounding board, then the iron,
harp-shaped frame to which the strings are fastened.
The tones of the piano are produced by felt-covered hammers striking
the strings. The sounding board, which is made of wood, magnifies the
tones.
This picture shows the mechanics glueing the sounding board to the
back.]
[Illustration:
Photo by Kohler & Campbell Piano Co.