A. S. Kimball — Sliding Friction on an Inclined Plane. 183 



of four experiments. The load in every case was 40 lbs. The 

 inclinations of the plane were as follows: No. 1 =15° 6', No. 

 2 =16° 9', No. 3 =17° 5'. No. 4 =18° 9'. 



Table A shows the accelerations corresponding to different 

 velocities in the four experiments. The units used are the 

 Y^Vo of an inch and the j^-g of a second. 



Table B shows the coefficients of friction in each experiment, 

 deduced by substituting the observed accelerations given in 

 Table A in the formula given above. The observed accelera- 

 tions were of course reduced to feet in a second. 



From the tables it will be observed : 1st. That with a given 

 inclination of the plane, the coefficient of friction decreases as 



