THERMOMETER AND PYROMETER. 63 



No. III. 



TABLE OF REMARKABLE TEMPERATURES ACCORDING TO FAHRENHEIT'S 



SCALE. 



Iron red hot in the twilight . . . . . . 884 



Heat of a common fire (Irvine) . . . . ' . 790 



Iron bright red in the dark . . . . , .752 



Zinc melts . . . . . . . 700 



Quicksilver boils (Irvine) ...... 672 



(Dalton) . . . , . 660 



(Crichton) . . . . . .655 



Linseed oil boils . . . . ... 600 



Lead melts (Guyton, Irvine) ...... 594 



Sulphuric Acid boils (Dalton) . . . . 590 



The surface of polished Steel acquires a deep blue colour . . . 580 



Oil of Turpentine boils . . . . , 560 



Phosphorus boils ....... 554 



Bismuth melts (Irvine) . . . . . . 476 



The surface of polished steel acquires a pale straw colour . . . 460 



Tin melts (Crichton, Irvine) . . . . . 442 



A Compound of equal parts of Tin and Bismuth melts . .. . 283 



Nitric Acid boils . . . . . . 242 



Sulphur melts #.... 226 



A saturated Solution of Salt boils . . . . . . 21 



Water boils, (the barometer being at 30 inches) ; also a Compound of 5 of Bismuth, 



3 of Tin, and 2 of Lead, melts . . . . .212 



A Compound of 3 of Tin, 5 of Lead, and 8 of Bismuth, melts . . 21 



Alcohol boils . . . . . . .174 



Bees' Wax melts . . . . . . 142 



Spermaceti melts . . . . . . . 1 33 



Phosphorus melts . . . . . . 100 



vEther boils . . . . . . .98 



Medium Temperature of the Globe . . . . ... 50 



Ice melts . . . . . . .32 



Milk freezes . . . . . . . 30 



Vinegar freezes at about . . . . . .28 



Strong Wine freezes at about . . . . . . 20 



A Mixture of 1 part of Alcohol, and 8 parts of Water, freezes . . 7 



A Mixture of Alcohol and Water in equal parts, freezes . . . T 



A Mixture of 2 parts of Alcohol and 1 of Water, freezes . . .11 



Melting point of Quicksilver (Cavendish) . . . 39 



Liquid Ammonia crystallizes (Vauquelin) . . . .42 



Nitric Acid, spec. gr. about 1.42, freezes (Cavendish) . . 45 



Sulphuric ./Ether congeals (Vauquelin) . .47 



Natural Temperature observed at Hudson's Bay . . . 50 



Ammoniacal Gas condenses into a liquid (Guyton^ . . .54 



Nitrous Acid freezes (Vauquelin) . . . . . 56 



Cold produced from diluted Sulphuric Acid and Snow, the materials being at the 



temperature of 57 . . , . . 78| 



Greatest Artificial Cold yet measured (Walker) . . . .91 



