A description and history of the pianoforte and of the older keyboard stringed instruments . DIAGRAM, HERZ-ERARD ACTION. ppring. When an under-damper is used it resembles that in thediagram of Erards. We now come to the upright action, which was originally patentedby Wornum in 1826, although not practically introduced in hispianos until 1829. The diagram described is Broadwoods modelof that mechanism. It is hardly necessary to repeat that in makingthese actions there are variations, due to the intention or experienceof each maker who is not a mere copyist. a is the key, h the hopper, c the not
A description and history of the pianoforte and of the older keyboard stringed instruments . DIAGRAM, HERZ-ERARD ACTION. ppring. When an under-damper is used it resembles that in thediagram of Erards. We now come to the upright action, which was originally patentedby Wornum in 1826, although not practically introduced in hispianos until 1829. The diagram described is Broadwoods modelof that mechanism. It is hardly necessary to repeat that in makingthese actions there are variations, due to the intention or experienceof each maker who is not a mere copyist. a is the key, h the hopper, c the notch, d the hammer-butt, in THE ACTION. 37 which is inserted the shank of e, the hammer-head; / is thecheck, g the damper, h is the set-off button held by a rail, i is thehopper spring—in this diagram the spiral spring—invented by thelate A. Bord. In the actions of the higher upright instrumentsthere is necessarily a pilot n, to raise the hopper and its crank to the. UPRIGHT PIANOFORTE ACTION, JOHN BROADWOOD AND SONS, LONDON, 1895. height required for their service. The special merit of Wornmi] sinvention is the tape ^t, which is tightened by the rise of the hammerwhen the key is struck, so as to pull the butt back, and, of course,the hammer with it, when the key returns, to assist the repetition ; \ 38 THE PIANOFOHTE, the button v, projecting from the hammer-butt, falling into check,as it is called—in other words, preventing, by the contact of checkand button, the hammer falling too far, the radius of the fall of thehammer always depending upon the force or velocity of blow givenby the player. In the large number of square and upright pianos formerlymade that had no checks, a pad of leather behind the jack orsticker of the hopper was in some measure a substitute, a leveralso clothed with leather and sometimes called an under-hammerto raise the long hinged sticker resting upon this pad. What-ever the touch may be, a certain resistance that shall
Size: 1451px × 1722px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlondo, bookyear1896
