By 1840 Wornum had improved his grand actions by adding a sustaining spring tying the hammer butt and the short end of the crank lever, intended to improve repetition and " assist in the forte, " but eventually abandoned the inverted construction due to its inconvenient form and included claims for a new disposition of the crank lever and escapement, as well as a method of operating the damper in uprights with a leather strip attached either to the hammer butt or to a wire fixed in the key.
12.
By 1840 Wornum had improved his grand actions by adding a sustaining spring tying the hammer butt and the short end of the crank lever, intended to improve repetition and " assist in the forte, " but eventually abandoned the inverted construction due to its inconvenient form and included claims for a new disposition of the crank lever and escapement, as well as a method of operating the damper in uprights with a leather strip attached either to the hammer butt or to a wire fixed in the key.
