ON FLUIDS. 



137 



main, at each experiment, for 15 minutes. The liquid to be and the rife of 

 examined, and all the apparatus (but the iron bar), were, ^^lachkiM 

 each experiment, afeertained to be at 67°. The liquid was neath, was ob- 

 poured into the wooden veffel, till it could rife 0.1 inch on ( * r . vtd in threc 

 the fide of the iron cylinder when in its place: The wooden 

 top was put on, and the iron was drawn out of the kettle 

 of boiling water by means of the attached firing, and inftantly 

 let down through the hole of the cover. The time the ther- 

 mometer took to rife through three degrees (to 70 p ) was ac- 

 curately marked by means of a flop-watch, and the refults of 

 my experiments on feveral fluids are exhibited in the fol- 

 lowing 



TABLE. 



Table of refults, 



As the water in the firft experiment was employed at a The tempera- 

 temperature above 42°, it could not affea the thermometer by t«re. w a» always 



J too high to pro- 

 any change of denfity ; it may therefore ferve as a ftandard duce adefcend- 



to compare the other liquids. With regard to the differences in S current i« 

 err i , . ,,„ ■ .... water by heat- 



ot a tew leconds, we need not infill on it as indicating any ; n g. 



material difference between the conducting power of the differ- 



rent fubftances ; becaufe the eye may not be able to mark it 



inftantaneoufly ; but where this difference amounts to nearly 



a quarter 



