ABRASION OF THE SURFACES OF SOLIDS. 



161 



Table IX. 

 Experiments on the Friction of Axles without and with Unguents. 



Weight on Axle, Weight required to move it. Time. Proportion. Space passed over. 



Gun Metal on Cast Iron. 



cwt. 

 1 

 2 

 3 

 4 

 5 

 6 



7 



8 



9 



10 



AfterremaininglS hrs. 

 it took to move it 



7.00 

 7.46 

 7.63 

 7.37 

 5.00 

 5.01 



5.09 

 5.12 

 5.04 

 4.70 



4§ inches. 



Yellow Brass on Cast Iron. 



cwt. 

 10 



lbs. oz. 

 372 



sec. 

 90 



4.11 



4| inches. 



Cast Iron on Cast Iron. 



cwt. 

 10 

 11 



lbs. oz. 

 173 8 

 228 



sec. 



90 



6.45 

 5.40 



4§ inches. 



Cast Iron on Cast Iron with Black-lead. 



cwt. 



11 



lbs. oz. 

 161 



sec. 

 90 



7.65 



4i inches. 



Gun Metal on Cast Iron with Black-lead. 



cwt. 

 11 



lbs. oz. 

 170 



sec. 



90 



7.24 



4| inches. 



cwt. 



1 



2 

 3 

 4 

 5 

 11 



Yellow Brass on Cast Iron with Black-lead. 



lbs. oz. 



14 12 



31 4 



47 8 



65 8 



84 



181 



90 



7.59 

 7.16 

 7.07 

 6.83 

 6.66 

 6.80 



4^ inches. 



cwt. 



11 



MDCCCXXIX. 



Gun Metal on Cast Iron with Oil. 



lbs. oz. 

 218 8 



sec 



90 



5.63 



4| inches. 



