batswing

To counteract this difficulty, M. Somzee adopts a heating burner, A, which he places between the two batswing burners,

Scientific American Supplement, No. 561, October 2, 1886 Various

As exemplified by Mr. Heron, if two equal batswing burners separately give a certain amount of light, on the two flames being brought into contact, so as to form a single flame, the luminosity is considerably increased, owing to the condensation of heat which results from their meeting.

Scientific American Supplement, No. 561, October 2, 1886 Various

This is best seen when the gas is turned low -- with a batswing burner, for instance -- turned so low that only a small non-luminous flame is left, the space between burner and flame will appear as great as the flame itself, while, if the gas is mixed with an inert diluent like carbon dioxide, the space can be very much increased.

Scientific American Supplement, No. 795, March 28, 1891 Various

The right way, per contra, is to use a batswing burner to heat, say, two inches of the tube with constant turning till it is very soft, and then, holding the glass so that the bend will be in a vertical plane passing through one eye (the other being shut), to make the bend rather slowly.

On Laboratory Arts Richard Threlfall

If this is compared with the batswing burner, which produces the light of 1 carcel with a consumption of 120 liters of gas, the economy is greater -- varying, according to the type of lamp, from 41 to 85 per cent.

Scientific American Supplement, No. 664, September 22,1888 Various

There is also the Delmas hot air burner, in which the batswing flame is completely inclosed in a glass, mounted with a sheet-iron casing, heated by the products of combustion, through which the air passes on its passage downward to feed the flame; and it thus increases the temperature, improves the illuminating power, and produces a beautiful steady light.

Scientific American Supplement, No. 664, September 22,1888 Various

The burners should be union jets -- _i.e. _, burners with two holes at an angle to each other -- not slit or batswing, as the latter are extremely liable to partial stoppage with dust.

Scientific American Supplement, No. 481, March 21, 1885 Various

Where batswing burners are used, I have often seen fully 90 per cent. more or less choked and unsatisfactory; whereas a union jet does not give any trouble.

Scientific American Supplement, No. 481, March 21, 1885 Various