which add materially a piano with the front of the case removed. H is the iron the support of the iron frame at its back, is entirely dispens- to the value of these instruments, rendering them capable of plate or frame, made strong enough to bear the full strain of ed with, and so the disadvantages… … wood. them in the wood. Some- Fig. 4. 3. The piano times the iron plate is extend- ed to cover the whole of the is easily and ex- the strings without any wood support at its back, which is wooden frame, and in that actly tuned, and so left open for more perfect and free vibration of strings case…
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