Archive image from page 262 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 Diagram representing the position of the ribs affected by the position of the spine. simultaneously, the first four would approxi- mate, whilst all the rest would recede from each other. Therefore the positions of the different parts representing the spine in fig. 679. command and regulate these changes. allowing of free rotation upon a rigid per- pendicular body A a ; let the free extremities of these bars be kept apart, so that the bars may at all times b
Archive image from page 262 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 Diagram representing the position of the ribs affected by the position of the spine. simultaneously, the first four would approxi- mate, whilst all the rest would recede from each other. Therefore the positions of the different parts representing the spine in fig. 679. command and regulate these changes. allowing of free rotation upon a rigid per- pendicular body A a ; let the free extremities of these bars be kept apart, so that the bars may at all times be parallel to each other. In this condition a certain distance exists between the bars, and a certain distance be- tween their free extremities and the perpen- dicular body A a. Let B represent the same bars moved into another position, resembling that of the ribs; in this position, the two conditions seen at A are altered. The perpendicular distances between the bars are diminished, and the distance between the free extremities of the bars and the body B b is likewise diminished. If the direction of this motion were still continued, the bars would ultimately touch each other, and their free extremities would be still nearer to the body B b. But let the bars be elevated, as in c c, and the same condition obtains as in the bars at B b, viz., they approximate each other, and the free ends come nearer to the body, c c. In this case the bars only have moved ; but the same effect can be obtained without moving the bars. Let A B (fig. 678.) be two bars at their maximum distance, while horizontal; at a b, and a' b'', they have nearly attained their minimum perpendicular distances, though still hori- zontal, because the rigid bodies c c arid c' c' have been moved respectively. Now, if we join these hree last figures into one, as in fig. 679., an then move the bars simulta- neously, some bars will approximate each other, whilst others will recede. The superior four are at their maximu
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