PEIRCE. — OSCILLATIONS OF SWINGING BODIES. 



75 



numbers in the first column of the next table show the lengths of 

 successive ordinates (taken at equal time intervals) of the curve drawn 

 on the photographic record through the crests of the oscillations. 

 The next column gives the lengths of the corresponding ordinates of a 

 curve of the family A • e~ at drawn exactly through the fifth and tenth 

 crests. The very tips of the needles at the beginning of the motion 

 passed over about 10 centimeters of path per second. 



Figure B. 



IV. Figure B shows the manner of decay of the oscillations of a 

 light suspended system under the action of very strong restoring forces. 

 A small mirror and two 15 millimeter long watch-spring magnets were 



