232 S. F. Peckham on a new apparatus 
for furnishing superheated steam or carbonic acid gas, either of 
which are sometimes used to assist the distillation of hydrocar- 
bons. Both the goose-neck and valve should be connected with 
the retort by a short piece of gas-pipe and a brass “ union” or 
coupling, as the difference in the expansion of brass and iron 
would cause a joint of the two metals to leak very badly when 
subjected to a high temperature. The goose-neck may be made 
of the ordinary form, tapering from one inch to one-quarter inch, 
and about ten inches in length. e material should be copper, 
brazed. The valve will be described hereafter. 
both discs in their places. The goose-neck or valve is then ad 
j , and the connections made with the worm and recelvel. 
It will be observed that all the expansion that takes place in this 
retort only brings the different portions of the apparatus mor 
firmly together, instead of causing them to crack apart and leak 
with every slight variation of temperature, as is usually the 
. With this arrangement I was able to distill fifteen hun- 
dred cubic centimeters of petroleum to dryness, the last portionS 
coming over at a red heat. The distillation was commenced 
with two ondaaty Bunsen’s gas lamps, increased as required 10 
, and toward the end of the operation to six—the latte! 
— being sufficient to bring the side of the retort in contact 
ever form, inbedded in coal fires or suspended over them, must 
be aware of the difficulty of so regulating the fire as to secure : 
= se eine _ may be distilled by means of a sand- bat 
. ase ! sient numde 
of lamps direct] y applying the flame of a sufficien 
y¥ per cent by measure, and wilt 
a of thirty pounds per square inch the average the 
Tees Jaeven and one-half per cent. In the latter instance 
ss 
was 
