1817.] during the Year 1816. 19 
During these experiments the authors observed that the dilatation 
of glass and of the metals was sensibly proportional to that of mer- 
cury ; so that twice the number of degrees gives a double dilatation. 
Tempered steel alone presented striking exceptions to this law. 
Tasxre Il.—Linear Dilatations from 32° to 212°, according to 
the Experiments of Troughton. 
BRLECL safely hake. odbel> s.che s@PS\ou2 40 « e+. O'0011899 = 3, 
Silvan OE: -/ steal ge Aaa de «2s Q°0020826 = 71. 
Cede ulsianiendsaner + 4sgnns COMrgI ses! 
MOD) WITS, 2» wri jncagees esse 070014401 = 54> 
Platina 2). HAR. hh 4 HT 0:0009918 = —- 
Palladium (according to Wollaston) 0°0010 =e 
Taste IlI.—Dilatation of Liquids in Volume between 32° and 
212°, according to Dalton. 
| 
MERPOAUIC SCL S ctecetens ifs! «gate ol: \waeaodee~ =! © hanes 00600 = +, 
Wipteic acts... steiviaisels 0 G°Oh 6 ols desta: dey D'RLOD = jd 
Naiphurie acid: «'.9...\. 01%. .[. Pe. visio see's P'OGOO = 
Alcohol ....... seu ote = pain fel erateet delat LT UO a= oe 
WHORE Fad - «fet «bes Sb « «fe okjset 4~ date, P'0466) =... 
Water saturated with common salt.......... 0°0500 = 1. 
Joo 6. 2) 48 eRe a etate falsteee sie a 0°0700 = 
RRL US hy ' siiheDninla WER “isha ole 46 «ches «36, D'OSOO z= ot. 
Oil of turpentine ......./../.... gestae se DIOZOO .S— -t 
LE AE eee tial OUD. == at 
Mercury according to Lord C. Cavendish... 0°01872 
o) 
| 
TaBLe 1V.—Dilatation of Liquids. 
Gay-Lussac has lately made a set of experiments on the dilatation 
of liquids, in order, if possible, to discover the law by which this 
dilatation is regulated. The experiments were made in thermo- 
meter tubes hermetically sealed. The boiling point of each liquid 
was pitched upon as the zero, and the degrees were reckoned from 
that point downwards according to the centigrade scale. The liquids 
pitched upon were water, alcohol, sulphuret of carbon, and sul- 
phurie ether. Their boiling points were as follows :— 
Water Soi, RVG, SORE LOOM; dt 19197 Kake, 
Alcopol......,. seciead | cee ehas kee 
Sulphuret of carbon .... 46°60 .... 126 
Sulphuric ether........ 35°66 .... 96 
The following table exhibits the contractions which took place in 
the volume of these bodies respectively when exposed to different 
temperatures below their boiling points :— 
Bn 2 
