-----------------------------------+----------------------------------- "Regulator" Burners. | "Special" Burners. ------+------+-----+-------+-------+------+------+-----+-------+------- No. |Pres- |Cubic|Illumi-|Illumi-|No. |Pres- |Cubic|Illumi-|Illumi- of |sure |Feet |nating |nating |of |sure |Feet |nating |nating Burner|in |per |Power |Power |Burner|in |per |Power |Power |Inches|Hour |in |per 5 | |Inches|Hour |in |per 5 | | |Stand. |Cubic | | | |Stand. |Cubic | | |Candls.|Feet. | | | |Candls.|Feet. ------+------+-----+-------+-------+------+------+-----+-------+------- 3 | 0·5 | 4·16| 12·6 | 15·1 | 3 | 0·5 | 3·37| 12·4 | 18·4 3 | 1·0 | 5·64| 16·6 | 14·8 | 3 | 1·0 | 5·25| 20·4 | 19·4 3 | 1·5 | 7·83| 21·0 | 13·4 | 3 | 1·5 | 7·13| 24·0 | 16·8 4 | 0·5 | 4·26| 14·0 | 16·4 | 4 | 0·5 | 3·67| 13·0 | 17·7 4 | 1·0 | 6·74| 21·2 | 15·6 | 4 | 1·0 | 5·55| 20·6 | 18·6 4 | 1·5 | 7·81| 24·0 | 15·3 | 4 | 1·5 | 7·13| 26·0 | 18·2 5 | 0·5 | 4·76| 15·4 | 16·2 | 5 | 0·5 | 3·86| 14·6 | 18·9 5 | 1·0 | 6·93| 20·4 | 14·7 | 5 | 1·0 | 5·85| 22·6 | 19·4 5 | 1·5 | 8·72| 25·8 | 14·7 | 5 | 1·5 | 7·53| 28·0 | 18·6 6 | 0·5 | 6·04| 20·0 | 16·5 | 6 | 0·5 | 4·86| 19·4 | 20·0 6 | 1·0 | 8·82| 29·4 | 16·6 | 6 | 1·0 | 7·53| 31·6 | 21·0 6 | 1·5 |11·10| 31·6 | 14·2 | 6 | 1·5 | 9·60| 39·0 | 20·4 ------+------+-----+-------+-------+------+------+-----+-------+------- The quality of the gas operated upon averaged about 19 candles when tested with the Standard London Argand Burner. In a former part of this treatise it was remarked that the flames produced by the modern representatives[10] of the batswing and fishtail burners have lost the original resemblance to the objects whence the names of those burners were derived; and that the two flames have gradually approached each other in shape, until, in their latest developments, they are practically identical. We have seen how that, by the invention of the hollow-top, a burner is obtained apparently, to all outward appearance, the same as the batswing, yet giving a greatly improved form of flame. We have now to learn how the fishtail, or union-jet burner has been modified so as to yield a flame closely agreeing with that produced by the improved slit burner. [10] Although the true batswing is still in common use, I look upon the hollow-top as being its "modern representative;" seeing that, in a great many instances, it has superseded the former burner--of which, indeed, it is only an improved form. [Sidenote: How the union-jet burner has been improved.]