Excerpt from Proceedings of the National Academy of Sciences, Vol. 5: Of the United States of America; 1919 By cm Sm] 53 AN adjustment IN relation To the msnel coetticient. Carl Barns 120 superposed OR duplicated spectrum frmoes. By Carl Barys 149 AN approximate law or energy distribution IN the general x-ray spectrum By David L. Webster 163 A complete apparatus tor absolute acoustical measurements By Arthur Gordon Webster 173 the thermo-elecic equation P tdv idt once more By Edwin H. Hall 197 ON the x-ray absorption wave-lengths or lead isotopes By William Duane and Takeo Shimim 198 AN electrodynamometer using the vibration telescope. By Carl Barres 211 A new instrument tor measurmo pressures IN A gun By A. G. Webster and L. T. E. Thompson 259 ON the angle OP repose or wet.. By A. G. Webster 263 the elongation due To magnetization By C. Barns 267 acoustical impedance and the theory or horns and OP the phonograph. By Arthur Gorgon Webster 275 ON the possible form or the equation OP state OP powder gases By A. G. Webster 286 the relative absorption or mixtures or oxygen and nitrogen IN cocoanut sell charcoal By Harvey B. Lemon and Kathryn Blodgett 289 variations, due To heat mamnt, IN the rate or absorption or air BY By H aney B. Lemon 291 the interperometry or rapid vibrations chieply IN relation To telephone By C. Barns 331 ON the pressure variation or specipic heat or liquids. By C. Barus 340 A comparison or certain electrical properties or ordinary and uranium lead By P. W. Bridgman 351 radiation prom A moving magneton. H. Batman 367 rotatmg projectiles prom smooth-bore guns By C. G. Abbot 386. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.