GB190417584A - Improvements in Incandescent Gas Lamps. - Google Patents

Abstract

17,584. Keith, J., and Keith, G. Aug. 12. Incandescent gas lamps.-In inverted lamps for use with high-pressure gas and fitted with the burner described in Specifications No. 16,955, A.D. 1900, and No. 26,198, A.D. 1901, the mixing- tube d is insulated from the heavy burner head h by a non-conducting ring g, which also serves to secure the fitting j, to which a perforated globe q, an internal enamelled steel or other refractory reflector b, and an external reflector o are attached by modified bayonet fastenings. The usual burning-off and collodionizing processes in the manufacture of mantles are dispensed with. The mantle a is shaped in position on the reflector b, from unburnt impregnated fabric, by means of a mandrel d<1>, the mantle being held in position, both during the shaping process and subsequently when in use, by a spring-pressed or other dish c, Fig. 1, or by a ring g<1>, Fig. 4, or by a wire h<1>, Fig. 5, sprung over the beaded edge of the reflector b. During the shaping process, the fabric may be protected by an envelope of tissue paper, collodion, or other material which will burn off when the mantle is incinerated in sÝt¹. The products of combustion escape through the holes m, m, which are arranged so as to be as far as possible away, radially, from the inlets of the air-supply tubes e, e', and may be surmounted by short chimneys. The air supply is controlled by adjusting the screw-threaded nipple f, by partially closing the tubes e, e', or by means of a sliding sleeve. The lamp is suspended from the pendant or support by a piece of flexible metallic tubing, which serves as an anti-vibration device. In a railway-carriage roof lamp, the mixing-tube d is arranged horizontally, at right-angles to the vertical burner head h. In the event of the fracture of the mantle, a certain amount of light is obtained from the fragments retained by a wire basket attached to the reflector b.