1895.] 



Investigation of the Laios of Attrition. 



Alabaster and Alabaster. 



Weight per turn 

 per unit of force. 



Force. 

 35 



335 



. A_ 



> 



272 



35. 



309 





336 



28 



307 





280 



28 



318 





308 



21 



298 





233 



21 



245 





248 



14 



215 





294 



14 



278 





244 



7 



271 





314 



7 



280 





256 



4 



342 





292 



4 



375 





262 



2 



275 





250 



2 



309 





272 





Mean = 0*00289. 





,, . „ n i*i f First cylinder = 16' 7 



Mean circumference oi cylinders < ^ -. , , ~ 



J I Second cylinder = lo'o 



Alabaster and Plaster of Paris. 



Force. Alabaster. Plaster of Paris. 



14 13 102 



7 29 95 



Alabaster = 0*00021. Plaster of Paris s= 0*0098. 



. - * v j f Alabaster = 16' 7 



Mean circumference or cylinders ^ , _ _ . 



J I Plaster of Paris = 167 



Plaster of Paris and Plaster of Paris. 



Force. 



Weight per turn 

 per unit force. 

 ' ^ 



35 



104 



70 



35 



122 



82 



28 



115 



72 



28 



126 



91 



14 



115 



71 



14 



100 



75 



3 



126 



108 



1 



127 



108 



1 

 4 



88 



82 



i 



108 



100 





Mean = 0*0099. 





-».]- • <» a I- j f First cylinder =17*4 



Mean circumference or cylinders < _. , , . » -, » a 



I Second cylinder = 16*4 



