[ 610 ] 
A TABLE of Experiments, 
t 
By which the numbers in Tab. I. Col. 6. N° i, 2, and . 
4, were determin'd. 
"Experiment 1. The time elaps’d between ap- 
proaching the bar to the inftrument and taking the 
firft meafure, was half a minute : Therefore the in- 
tervals between taking the fucceeding meafures was 
half a minute alfo. The firft meafure was 208 5 the 
fecond 2 1 44 ; the third 21 6~ j the fourth 2 j j \. The 
differences of thefe are 6±, 2, and 1 ; which pretty- 
well tallies with the three laft terms of the following 
geometrical progreffion whofe common divifor is 2.8 ; 
•viz. 17.7 : 6.3 : : 2.25 : .8; therefore as the mea- 
iures increas’d from the firff, the firft meafure being 
diminifh’d by the firft term, vi z. 208 — 17.7 = 190.3, 
will be the true meafure of the bar at the firft inftant 
of its application, before it was expanded by the heat 
and moifture about the inftrument. 
Exp. 2. The firft meafure was 221^5 the fecond, 
227; third, 2307 ; fourth, 232-^5 whofe differences 
are 5^, 3^, and 2-4; agreeing with the three laft 
terms of the following progrefiion, whofe common 
divifor is 1.6 ; viz. 9.2 : 5.8 : : 3.6 : 2.2; therefore 
221.25- — 9.2 = 212.15-. 
Exp. 3. The firft meafure taken was 401 ; and 
at that degree of heat the wooden bar did notfenfibly 
alter during two minutes. 
Exp. 4. The firft meafure taken was 2 75^ ; fe- 
cond, 278I ; third, 280!-; and the fourth, 282-4: 
The differences are, 3, 27, lij agreeing with the 
three 
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