[ 611 ] 
three laft terms of the following progrefllon, whofc 
common divifor is 1.43; viz. 4.4: 3.1 :: 2.15: 1.55 
therefore 275'.^ — 4.4 — 271.1, which is the firft 
meafure corre&ed. 
Hence, as appears by ‘Tab. I. N* 1, 2, 3, and 4, 
Column 9. thefe experiments being properly reduc’d, 
agree within one divifion of the micrometer ; and the 
expanfion of the bafis, at a medium, is 287- parts 
thereof; correfpQnding to 1 66° of Farenheit’s ther- 
mometer. 
4 FI 2 
TABLE 
