Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 154 ELEMENTARY CHEMICAL MICROSCOPY the tiny flame B (reserve flame) employed for microchemical work is furnished by a small brass tube inside the Bunsen tube. This flame is always burning when the gas is turned on at the gas main; its height is regulated by the screw S so as to be from 3 to 4 millimeters high. If, as often happens, this tiny flame cannot be lowered to the proper size, remove the screw S, and drop into the hole a small fragment of very soft annealed copper wire, replace the
Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 154 ELEMENTARY CHEMICAL MICROSCOPY the tiny flame B (reserve flame) employed for microchemical work is furnished by a small brass tube inside the Bunsen tube. This flame is always burning when the gas is turned on at the gas main; its height is regulated by the screw S so as to be from 3 to 4 millimeters high. If, as often happens, this tiny flame cannot be lowered to the proper size, remove the screw S, and drop into the hole a small fragment of very soft annealed copper wire, replace the screw and turn until the copper fragment has been crushed sufficiently to partially obstruct the flow of gas. Fig. 88. Type of Small Blast Lamp for Microchemical Analysis. (Xi) Turning the stopcock A lights the large burner and serves to regulate the size of the Bunsen flame. The burner is not sold with the ring R, as shown in the figure, but this attachment can be made in a few minutes by fastening a bent copper or brass wire to a split brass ring which may be raised or lowered and maintains its position through friction, or, if possible, a heavier ring with thumb-screw is substituted for the simple ring. This wire ring is useful as a support when moderately long heating must be practiced or when evaporations over a tiny flame at moderate temperatures are required. For the production of higher temperatures than are possible with the flame of the Bunsen burner, a blowpipe will be found
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Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
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