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resulting in the width of black keys averaging mm and white keys about mm wide. the roman water organ had a row of little levers. evidence for this can be found on mosaics and carvings dating from before the collapse of imperial rome. during the tenth century, there was an organ at winchester cathedral
, it had stops and two manuals, probably consisting of lever type keys, all naturals with no accidentals, taking, it is said, three men to play it. the organ was the first instrument with a keyboard, and the weight of its keys, like that of many other instruments, varied. so much so, that it took the...
https://www.piano-tuners.org/history/compass.html