126 



GENERAL SCIENCE 



Character of Emitted Light. 



Temperature 



Degrees 

 Fahrenheit. 



Temperature 



Degrees 

 Centigrade. 



Dark red, blood red, low red 



Dark cherry red 



Cherry, full red . 



Light cherry, bright cherry, light red. 



Orange 



Light orange 



Yellow 



Light yellow 



White. . 



1050 

 1175 

 1375 

 1550 

 1650 

 1725 

 1825 

 1975 

 2200 



Temperatures are sometimes determined by bodies that shine 

 by incandescent light and not by actual combustion. 



DIFFERENT COLORS OF IRON CAUSED BY HEAT 



Color. 



Degrees 

 Centigrade. 



Degrees 

 Fahrenheit. 



Pale yellow 210 



Dull yellow ' 221 



Crimson 256 



Violet, purple and dull blue; between 261 and "| 



370 C. it passes to bright blue, to sea green, > 



and then the color disappears J 



Commences to be covered with a light coating 

 of oxide, loses a good deal of its hardness, 

 becomes more impressible by the hammer, and 



can be twisted with ease 500 



Becomes nascent red 525 



Somber red 700 



Nascent cherry . . 800 



Cherry 900 



Bright cherry 1000 



Dull orange 1100 



Bright orange 1200 



White 1300 



Brilliant white, welding heat 1400 



Dazzling white | 



410 

 430 

 493 



502 



680 



977 

 1292 

 1472 

 1657 

 1832 

 2012 

 2192 

 2372 

 2552 

 2732 

 2912 



