John Bethell

“ The mechanical arrangement by which the light is produced consists of a series of concentric rings, perforated on the upper surface for the escape of the gas, placed at equal distances from each other, and so arranged as to regulate the quantity of atmospheric air, and to communicate by conduction and radiation sufficient heat to raise the temperature of the gas to a given point, so as to effect the separation of its charcoal immediately on its leaving the burner, and then, by an arrangement above, to bring fresh atmospheric air to the proper points of the flame. ”

“ A perfect lamp will deposit the charcoal in the flame the instant it passes the jet. If so imperfect as to deposit too soon, charcoal will be found in the rings; if too late, then high up in the flame. There is a point of accuracy required which practice has determined. This mechanical arrangement brings about a series of chemical changes involved in the evolution of light and heat which are very interesting. The rapidity of chemical union governs the respective quantities of heat and light. By a too rapid combination, heat without light may be produced. ”

“ Builders seem to suppose that the fireplace, with the chimney, is the only ventilator necessary. This supposition is decidedly incorrect. The greater part of the air which goes up the chimney is drawn from the lower stratum of air in the room from which is coldest and purest portion, leaving the hot and impure air to collect in the upper part of the The Atmospheric Bude-Light remedies this important defect. It is always fixed high up in the room, with a large escape-pipe over it, leading to the chimney, which entirely carries off the products of the combustion of the gas. ”