The principles of myodynamics / By J.S. Wight.

  • Wight, J. S. (Jarvis Sherman), 1834-1901.
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: The principles of myodynamics / By J.S. Wight. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    components a and b. The velocity of the motion must also be considered, according to the prin- ciples above stated. 8. The inclined plane involves the principle of the rectanele of forces. For instance, when two bones meet at their articulation at an acute or an obtuse angle, one rests upon the other as a body on an inclined plane. 9. Let F c i Fig. j, be a movable bone, and o c a fixed bone, c being the joint. TJie muscle m has its origin at o, and its insertion at i. The force of the co7itracting mitscle is resolved into the tzuo components a and b : a acts in the direction i c and is a displacing component acting on the movable bone. But b acts in the direction i P and cordains a DISPLACING and a retentive component. A^oiu the force b acts at i and reacts at o in the direction 0 c : The fixed bone rests on the mailable bone as a body rests on an inclined plane : TJie fixed bone tends to descend on the movable bone—which is impossible: Hence the movable bone tends to go upward binder tJie fixed bone with the same force that the fixed bone tends to descend: And this force luJiicJi is equal b is resolved into the compon-