CHEMICAL AND PHARMACEUTIC MANIPULATIONS. 107 
of a brass cylinder piston 2, worked by a treadle which drives 
the air into a large tin box enclosed in a frame- work 1 imme- 
diately under the top of the table. From the front end of the 
box a tube rises through the table top, and terminating with 
its small jet within the interior of an Argand burner, urges 
the air directly upwards, producing a full flame. The Argand 
burner maybe connected with a lamp or reservoir, contain, 
ing a solution of oil of turpentine, or alcohol, or 
with a gas pipe. In the former case, the burner Fig. 6. 
has a circular wick with a contrivance for adjust- 
ing its height. The latter, being neater, and 
always ready, is almost exclusively used in the 
laboratory, as giving a powerful flame which 
may be elevated or depressed at pleasure. With one of the 
new fashioned Argand gas burners as shown by Fig. 6, 
this table forms an excellent substitute for ordinary furnace 
operations. — (Encyclopaedia of Chemistry .) 
"The Table Blow Pipe. — "This table may be used either 
with a Berzelius or Rose lamp, or the Argand gas burner. 
Gas, when furnished by public companies, is by far the 
most economical source of heat, and withal is powerful, 
readily manageable, and cleanly. For all the nicer ignitions, 
fluxions, and fusions it does away with the necessity of a 
furnace, which is less convenient, and requires tenfold the 
time for its action. In five minutes by the use of this im- 
plement, we can often satisfactorily complete processes 
which with a furnace would require an hour. This saving 
of time and fatigue is an important consideration when the 
operations are to be multiplied or rapidly repeated. It is ap- 
plicable to all the purposes of ignition, fusion, and fluxion of 
limited quantities of matter, and by 4 driving the current of 
air obliquely and somewhat downward through the Argand 
burner, the process of cupellation may be accurately per- 
formed on three hundred grains of lead.' " 
"When gas is used it is only necessary to bring the Argand 
