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| Keywords: Wornum5384.svg detail Robert Wornum's double action for the professional piano-forte Patent for improvements in piano-fortes - English patent no 5 384 1826-07-04 Robert Wornum 1780-1852 reproduced in Lawrence Nalder The Modern Piano The Gresham Press Old Working Surrey 1927 p 120 c Socket d Hammer e Hammer ruler f Hammer rail g Sticker e Damper wire and button h Check lever j Check k k Hopper centre and mortoise bushed lHopper spring fixed to sticker m Dog spring fixed in hopper to keep the hammer from dancing after the blow n Lifting wire for check fixed in sticker with worm and slipped into check lever hole bushed PD-old Musical instruments schemes Musical instruments technical diagrams Piano action SVG music | ||||
