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74 KEY-TREATMENT ; MUSCULAR ASPECT. |
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Fig. 8.—Description : * The arrows in the above, represent the directions in which the forces tend during bent finger-attitude.
a and b denote the direction of the energy resulting by recoil from the thrusting action of the finger and hand against the key, and manifesting itself upwards and backwards respectively at the knuckle and wrist joints.
c and cc, the energy that balances this, derived from arm-weight and force.
K ia the Knuckle; W the Wrist; E the Elbow, and S the Shoulder. |
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