Note 6 — HOME STUDIES IN CHEMISTRY AND PHYSICS.

“Bunsen Burner.” In this burner, at the lower end of the hollow stem through which the gas passes, there is a lateral orifice which admits the air necessary for combustion. This orifice can be made larger or smaller by means of a diaphragm which is used as a regulator. If a moderate amount of air enters, the gas burns with a luminous flame, but if a strong and steady current is admitted, the carbon is rapidly oxidized, the flame loses its brightness, and burns with a pale blue light, scarcely perceptible, and with intense heat.