Iron had for some time before this been in general use for framing, but
the frame was cast in a few separate parts, which were put together by
means of bolts and screws, a plan which is still used to a considerable
extent in Europe. By his plan of casting the frame and its supporting
bars in one solid piece, Mr. Chickering not only prevented the frame
from yielding to the pull of the strings, thus securing permanence and
purity of tone, but was enabled to use larger frames and more strings,
which greatly increased the capacity of the instrument.
Several other improvements were made by him, the most important of which
was the invention, in 1845, of the circular scale for square pianos,
which is now in general use in this country and in Europe. "This consists
in giving to the row of tuning pins and wrest-planks--previously
straight in these instruments--a curved disposition, answering nearly to
an arc of a circle, the advantage being that the strings become less
crowded, larger hammers, and a more direct blow can be secured, and the
tone is both strengthened and improved." With a rare generosity, Mr.
Chickering declined to patent this improvement, which would have enabled
him to drive competition out of the market.
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