It follows therefore that there arc as many possible mechanisms as there are links in the chain.
In warm-blooded animals, such as birds and mammals, protective mechanisms for the regulation of temperature enable them to endure exposure to extreme heat or cold, but in such cases the actually living cells do not appreciably rise or fall in temperature.
I-it fn~xavuc&), which might more properly be restricted to the theory of mechanisms, and which was indeed used in this narrower sense by Newton, has clung to it, although the subject has long attained a far wider scope.
In the Reiileaux system of analysis of mechanisms the principle of comparative motion is generalized, and mechanisms apparently very diverse in character are shown to be founded on the same sequence of elementary combinations forming a kinematic chain.
There are other arrangements of bars giving straight-line motions, and these arrangements together with ths general properties of mechanisms of this kind are discussed in How to Draw a Straight Line by A.