NATIONAL ACADEMY OF SCIENCES. 



Volume X. 



FIRST MEMOIR. 



THE ABSOLUTE VALUE OF THE ACCELERATION OF GRAVITY 

 DETERMINED BY THE RING-PENDULUM METHOD. 



BY 



CHARLES E. MENDENHALL, 



PROFESSOR OF PHYSICS IN THE UNIVERSITY OF WISCONSIN. 



PRESENTED TO THE ACADEMY BY ROBERT S. WOODWARD. 



89369°— vol 10—11 1 



