Tbis equation is applicable from the time t=T to the time t —T-j-Ti at which time the curve reaches the zero axis.

For purposes of analysis, it will be assumed that the bolt is unlatched just as the barrel rcachcs the battery position at the time t=T+Ti. The movement of the bolt after its release can be determined by using equation 2-10 in the same general way as for the barrel. In this case, since the bolt is driven by the bolt spring alone, the value K> is substituted for K, F„2 is substituted for F,,, and Mt2 is substi-

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