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— 901 —
between body and. object ; if not preceded by release — first motion towards the object.
Ends : First contact of hand with object.
2° SW — Movement of waiting.
A movement without definite purpose, to occupy time. Beginning : if preceded by another movement, end of that movement ; if preceded by a period of rest, first indication of the movement itself.
End : if suceeded by another movement, beginning of following movement ; if succeeded by rest, cessation of all movement.
3° SZ — Movement of withdrawal.
Begins : with cessation of contact between workman's hand and object released. Ends : with completion of movement in the direction taken.
DETAIL OF FOURTH GROUP OF MOVEMENTS.
D ■ — Displacement.
Movement of parts of the body directly connected with or resulting in the movement of an object, but not movements concerned with work upon the object.
i° DL — Displacement by lifting.
The lifting of an object without affecting the place of work. Beginning : First sign of lifting movement. End : Cessation of all sign of lifting.
Distinctions may be made by means of special symbols to denote lifting by the hand, fore-arm or shoulder.
2° DR — Displacement by rotation.
Begins with first movement towards imparting a movement of rotation to the object.
Ends with cessation of all sign of rotation.
Here, too, we can distinguish between rotation imparted by hand, fore-arm or shoulder, or between rotation imparted by a small or a great effort.
3° DI — Displacement by insertion.
Movement to insert one object in another, e. g. insertion of a bolt in its hole.
This movement begins with the reduction in the speed with which the first object approaches the second. It ends when the area of contact between the workmans hand and the object begins to diminish.
4° DH — Displacement by movement of an object towards place of work.
This movement begins with the first commencement of the transfer of the object in the desired direction and ends with the cessation of all movement in that direction.