A text-book on chemistryFor the use of schools and colleges . 4 to 40 to 36. If a piece of wire gauze be held over the flame of acandle or gas-jet, Fig. 53, the flamefalls to pass through ; but the gaseousmatter of which the flame consistsfreely escapes through no. u. the meshes of thegauze, and may be seton fire above it, as inFig. 54. Flame is ei-ther gaseous matteror solid matter in a state of minutesubdivision, temporarily suspended ingas brought to a very high tempera-ture. It can not, therefore, pass througha piece of wire gauze, because the me-tallic threads, exerting a high conducting
A text-book on chemistryFor the use of schools and colleges . 4 to 40 to 36. If a piece of wire gauze be held over the flame of acandle or gas-jet, Fig. 53, the flamefalls to pass through ; but the gaseousmatter of which the flame consistsfreely escapes through no. u. the meshes of thegauze, and may be seton fire above it, as inFig. 54. Flame is ei-ther gaseous matteror solid matter in a state of minutesubdivision, temporarily suspended ingas brought to a very high tempera-ture. It can not, therefore, pass througha piece of wire gauze, because the me-tallic threads, exerting a high conducting power, ab-stract its heat from the incandescent gas, and bring itstemperature down to a point at which it ceases to beluminous. The safety-lamp of Davy is an applicationof this principle; by it combustion is prevented from Give the order of conducting power among metals. What effecthas the purity of a metal on its conducting power? What effect isseen on holding wire gauze over the flame of a lamp ? How maywe show that the combustible matter passes through ?.
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