Filtering of precipitating silica

Details Filtering of precipitating silica Filtering of precipitating silica

C - Chemistry, Metallurgy

01

F

23/102, 23/175,

C01F 5/40 (2006.01) C01F 5/00 (2006.01) C01F 5/30 (2006.01) C01F 5/38 (2006.01)

Patent

CA 1118579

ABSTRACT OF THE DISCLOSURE An electrical lighting fixture having a housing which defines two enclosures thermally insulated and physically displaced from each other. An air gap is provided between the enclosures through which cooling air can flow. A lamp is positioned in one of the enclosures with control equipment for the lamp in the other. The enclosure containing the lamp is maintained at a pressure other than ambient pressure and means are provided for detecting a change in pressure within the housing and for discontinuing electrical supply to the fitting in the event of a predetermined pressure change.

313713

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