230 S. F. Peckham on a new apparatus 
Arr. XXVI—On a new apparatus for technical analysis of Peiro- 
leum and kindred substances ; by S. F. PEcKHAM. 
les. 
simple and inexpensive, and I am aware of no reason wh 
results furnished by it should not prove highly menage 
. . to e 
not consider that our author -has added anything to proc 
long in use. en he arrives at the second distillation, or that 
which corresponds to the primary distillation of petroleum, be 
18 attended with considerable danger from fire. It is unsatit 
factory, because the separation of fluids of different densities and 
different boiling points, is much less complete than by Warren’ 
process, for any temperature below the boiling point of mercury; 
Infact, for ri temperature necessary to ensure the complet 
Separation of the light oils usually called naphtha, and the “pho 
new or illuminating oil.+ It is expensive, for the reason that 
if the distillation is conducted to dryness the retort is sacrificed, 
a8 If is rarely possible to remove the coke with safety. It is ab 
to fracture from ger Om fire, because the best retorts are liable 
wien she. ‘rom the high heat to which they are exposed, even 
ne greatest care is exercised in conducting the operation. 
Assay of Coal, ete., for Paraffin Oi Oil and Petro 
hgh : Laban ol ae one sad pag Attfield, Phe 
em. News, vol. xiv, p. 98, rt Pharmaceutical Society of Great f 
Mews, sol ai gens Bocens, see Mem. American Academy, N. S., vol. ix, Cbe™ 
