digitorium
digitorium. A small portable apparatus for the use of kbd. players wishing to strengthen their fingers. It usually had no more than 5 keys and these had strong springs so that considerable force was required to depress them. Invented by Myer Marks about the middle of the 19th cent.
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Qattara Depression Springs , Springs
A spring is a device that changes its shape in response to an external force, returning to its original shape when the force is removed. The…
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digitorium