LARGE GAS BURNERS.

269

very pleasing effect in the apartment in which it was placed,the ventilation having been sufficient to carry away all thevitiated atmosphere it produced.

637. Figs. 212 and 213 represent a different form of bur-ner, which may be introduced, with advantage, in peculiar situ-ations, where a sufficient ventilation can be commanded; hutit is not regulated with facility, and presents no special recom-mendations where the form of the light, as seen from a distance,is not an object. Mr David Cowan (Hungerford Street, in theStrand) has lately introduced an argand ring burner, which heprefers to the ordinary form of the argand burner.