[ 164 ] 
time; fo that the longer the inter- 
val between filling it with air and 
pufhing in the flider is, the more 
the infide of this tube is cleared 
from water, and thus the more air 
it will contain. This error may alfo 
amount to three fub divifions. 
Vi. The fixth error, which may. 
becom mitted by the fmall tube or 
neat — is indeed remedied” in. the 
meéafure in ufe by our ‘author By 
the flat flider; ‘but it remains im 
the meafure which is ftill ufed by 
other philofophers, which confifts 
only if a common phial not pro- 
vided with fuch’a flider. ‘The er- 
ror T refulting from the want of this 
flider may amount to ten, and even 
more fub-divifions. 
Vil. The’ feventh error may ree 
pefid’ upon the difference i in the di- 
= ameter of the frmall meafure com- 
oe pared 
