340 



APPENDIX. 



TABLE VI. 



TABLE of the Effects of Heat. 



t( 



II 



' Wedgwood's 

 I _ Scale. 



Greales; heat observed 



Hessian crucible fused 



Cast iron thoroughly melted 



Greatest heat of a smith's forge 



of a plate-glass furnace .... 



of a tiint-glass ditto 



Derby porcelain vitrifies 



Welding heat of iron (greatest) 



a u a u (least) 



Fine gold melts 



Fine silver melts 



Swedish copper melts 



Brass melts 



Diamond burns 



Red heat fully visible in daylight 



Iron red-hot in the twilight , 



Charcoal burns 



Heat of a common fire 



Iron bright-red in the dark 



Zinc melts (680- Davy) 



Mercury boils (Black"' 600-) (Secondat 644-) Petit and 



Dulong) 



" " (Crichton 655) (Irvine 672-) (Dalton) . 



Lowest ignition of iron in the dark 



Lead melts (Guyton and Irvine 594) (Crichton) . . . 



Steel becomes darlc blue, verging on black 



" " a full blue 



Sulphur burns 



Steel becomes a bright blue 



*' " purple 



brown, with purple spots 



brown 



Bismuth melts 



Steel becomes a full yellow 



" " a pale straw color 



Tin melts 



Steel becomes a verv faint yellow 



Tin 3 4- lead 2 4- bismuth 1. melts 



Tin and bismuth, equal parts, melts 



Bismuth 5-j-tin 3 -|- lead 2, melts 



Water boils (barometer 30 in.) 



Water freezes 



INTilk freezes 



Vinegar freezes 



Sea water freezes 



Strong wine freezes . . • 



Quicksilver congeals 



Sulphuric eether congeals 



Natural temperature at Hudson's Bay 



Great artificial cold 



Fahrenheit • 

 Scale. 



u 



u 

 (I 



656 



660 



635 



612 



600 



560 



560 



550 



530 



510 



490 



476 



470 



450 



442 



430 



334 



283 



212 



212 



32 



30 



28 



28 



20 



—39 



—47 



—51 



—91 



