574 Application of Hot Water in Heating Hot-houses. 



Experiments on the Motion of Liquids in Tubes of Glass at 

 different Temperatures. 



Liquids. 



b^Fahrenhei?! 



Head pro- 



Velocity in 

 second. 





Horizontal Tubes "0178 inches in diameter, and length 38'5 in. 



RainWater . . 

 Ditto .... 

 Ditto .... 

 Ditto . . ' . 

 Spirit of Wine . 

 Ditto .... 



64 



158 



5SJ- 



9-45 

 163 



163 

 56 

 945 



270 



38- 2- 

 393 



39- 9 



213 



•00183 

 •001537 

 •00143 

 •00139 

 00417 

 00317 



Horizontal tube 0 257 inches diameter, and length 38"5. 



RainWater . . 





2'2 



2-2 

 2'2 

 2-2 



5*2 

 53 





•00207 



Ditto .... 

 Salt Water . . 

 Ditto .... 



Ditto .... 

 Spirit of Wine . 



53 

 39 



54| to 56| 

 58| 



15-2 

 13-6 

 13-8 



199 



•00183 



•002311 

 •00198 \ 

 •00 165 J 

 •00294 



Classing these results we have 





Value of Friction. 



Temperature. 





Salt Water. 



Spirit of Wine. 



39 



00207 



•0024 





53 1 

 64/ 



•00183 



•00198 



•00342 



99 1 

 113 

 158 



•001537 

 00143 

 •00139 







From whence it appears that for the usual temperature of 



