CHANGING IDENTITIES 



ago concluded with the preacher, " There is a time 

 for all things/' 



Let a snowball be thrown into boiling water; it 

 will take time to melt the snowball. 



The electric spark takes time to cross the At- 

 lantic. 



Even light takes time to come from the stars 

 to us. 



But one arm of our weighing scale goes up just 

 as the other goes down. 



When we strike the drill with our hammer on 

 one end, at the same instant it strikes the rock with 

 the other end. 



Yet the drill is not one whole, but the particles 

 composing it may rebound that blow onto our nose, 

 and we may note an instant between the given blow 

 and the recoil. 



But the weighing beam acts as one whole. And 

 a string of primary spheres in one straight line 

 touching one another must act as one whole body, 

 if a force act upon them in that same straight 

 line. 



But in many cases, we think that force is trans- 

 mitted instantaneously, when it really is not, and 

 cannot be when it acts through particles capable 

 of change in position without changing the position 

 of all the particles of the body or bodies. 



Let Figure A represent two series of suspended 

 elastic balls, and let B represent an elastic plate 

 hung so it will strike both series of balls at once. 

 Then if no time were required for the transmission 



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