TABLE 149. 



FRICTION. 



The following table of coefficients of friction f and its reciprocal i/f, together with the angle of friction or angle of 

 repose <, is quoted from Rankine's "Applied Mechanics." It was compiled by Rankine from the results of 

 General Morin and other authorities, and is sufficient for all ordinary purposes. 



* Quoted from a paper by Jenkin and Ewing, " Phil. Trans. R. S." vol. 167. In this paper it is shown that in 

 cases where " static friction " exceeds " kinetic friction " there is a gradual increase of the coefficient of friction as the 

 speed is reduced towards zero. 



SMITHSONIAN TABLES. 



135 



