A gas-burner specially arranged for heating.
The Bunsen burner is preferred, as it gives a blue, smokeless flame, with great heat.
Its due performance depends upon the proper admixture of gas and air. If gas be in excess, the flame gives light and smoke and little heat.
If air be in excess, the mixture explodes, and the gas takes fire within the tube.
See Griffin's Chemical handicraft, London, 1866, pages 96, 97.
See also Die Spectralanalyse, Schellen, Braunschweig, 1870, page 18.
Figs. 5924, 5925, 5926, 5927, show the mode of application, and several forms of the device.
a, from Griffin.
b, Rosette-burner (Griffin).
c, Rosette-burner (Griffin).
d, Bogart, 1867.
e, Allen; patent, September 7, 1869.
f, Bradley, 1865.
g, McGlensey; patent, June 19, 1860.
h, Osmond; patent, March 14, 1865.
i, Griswold, 1868.
j, Bloxam's Chemistry.
k, Webb and Parkin, 1871.
l, Lazear and Sharp, 1868.