Search Results for: Reception apparatus for television incorporating sound recorder
"the upper row of keys is for the piano forte, and the lower for the harpsichord." oct. , sebastian erard. two methods for escapement of the hammer, and an arrangement for striking one, two, or three strings at pleasure, by a side movement of the damper rail, etc. harmonic octave produced by mechanism
stringing tenor and treble. the length of the first note is determined on the monochord, " and for all the 'corresponding notes upwards you must halve the several notes, and so on for as many octaves as you require, always halving for the last octave." this is intended to produce equal tension throughout...
https://www.piano-tuners.org/history/patents.html