C 167 ] 



error of three fub-divifions may be 

 committed. 



V. The fifth error may depend 

 on the difference of time between 

 the letting up each meafure and 

 examining the column. From this 

 head a difference of 10 fub-divifi- 

 ons may enfue. 



VI. The fixth may be in deter- 

 mining inaccurately the length of 

 the column of air in the tube, 

 which may amount to five fub-di- 

 vifions. 



■VII. The feventh error may de- 

 pend on the tube being kept in a 

 direction more or lefs perpendicular, 

 which may amount to three fub- 

 divifions. All thofe errors refulting 

 from the great tube make together 

 35, and amount, in the three mea- 

 fures of nitrous air let up in one 

 M 4 experi- 



