Gear's illustrated catalogue of wood and iron working machinery (1872)
A.S. Gear, Gear, A. S · Boston : Printed at A.S. Gear's printing office, 62 Sudbury Street · leaf 394
.Description of Steinway & Sons Patented Inventions. Overstrung scale in square pianos, invented by Steinway & Sons. The first piano so constructed was exhibited bythem at the Crvstal Palace, New York, 1855, and awarded the First Gold Medal. Fjgure S, … Figure B shows the construction of the iron frame, with overstrung scale and the agraffe arrangement throughoutthe entire length. Secured by letters patent No. 26300, dated November 29, 1859. Shows also the duplex scale applied to the treble, described more fully in Patent No. 10. No. 2—PATENT…
