180 



HANDBOOK OF MECHANICAL DESIGN 



* In grams per 10,000 revolutions — Amsler wear test machine — without lubrication. 

 t As determined on Amsler wear test machine. 



t Foot-pounds of work required to break specimen 0.400 X 0.400 in. 



§ Number of blows of hammer weighing 7.5 lb. falUng 2 in. required to deform specimen 5 per cent. Specimen diameter 0.394 in., length 

 0.788 in. 



Note: Other alloys may be found, whose chemical and physical characteristics differ but little, and consequently 

 their performance does not materially enhance their bearing value. Any operating condition can be met by the above 

 10 preferred bearing alloys. On page 181 is given a chart which indicates the field of application for bronzes of various 

 percentages of copper, tin, and lead. 



