A text-book on chemistry : for the use of schools and colleges . 58 CONDUCTING POWER OF Fig. 44. gaseous matter of which tho flame consists freely escapes through the meshes of thegauze, for it may be set on fire, as shown inthe figure. Flame is gaseous matter, orsolid matter in a state of excessive sub-division, temporarily suspended in gas,brought to a very high temperature. Itcan not, therefore, pass through a piece ofwire gauze, because the metallic threads,exerting a high conducting power, ab-stract its heat from the incandescent gas,and bring its temperature down to a point at w
A text-book on chemistry : for the use of schools and colleges . 58 CONDUCTING POWER OF Fig. 44. gaseous matter of which tho flame consists freely escapes through the meshes of thegauze, for it may be set on fire, as shown inthe figure. Flame is gaseous matter, orsolid matter in a state of excessive sub-division, temporarily suspended in gas,brought to a very high temperature. Itcan not, therefore, pass through a piece ofwire gauze, because the metallic threads,exerting a high conducting power, ab-stract its heat from the incandescent gas,and bring its temperature down to a point at which it ceas-es to be luminous. The safety-lamp of Davy is an appli-cation of this principle ; by it combustion is prevent-2,,<r. 45. ed from spreading through masses of explo-sive gas, by calling into action the conduct-ing power of a metallic gauze, with which thelamp flame is surrounded, as in Fig. 45. Thesafety-tube of Hemmings, used to prevent ex-plosions in the oxyhydrogen blow-pipe, acts onthe same principle. Count Rumford made several experiments todetermine the conducting power o
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