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112
249
41%
308
8.
29
84
77
491
250
30)
49
82
: St
350
492
82

Pacific Mine...
Pennsylvania Coal Company's Coal Trade

491

77
239
830

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Lehi h Iron Dis: ict..
Lelugli l'alley R. ilroad.

Liege Journal, A ticle in.
Linie tot ex, Corruption of, in the Manu-

facture of Cryde Iron.

M

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Pennsylvania Iron.

521
Pew'abic Mine..

273
Phleger's Boiler.

291
litch, a Lake of.

424
Pittsburg and Boston - Cliff Mine Stock 277
Placer County

106
Placer Mining.

108

303
Plaster Banks of Sonth Western Virginia.. 317
Platina ..

424
Precious Metals, what becomes of

517
Preparation of the Ores of Silver-Lead

and Copper, and their Metallurgical
Treatment at the Works at Lozere,
France....

223
Processes for the Distillation and Purifica-
tion of the Products of Coal..

12
Progress of the Iron Manufacture..

13
Pyritous Ores, on the Roasting of..

447

005
302

418

59
417
112
810

113

269
292
214

Quantity and Valne of Railroad Iron Im-

porteil for 16 years Statement....
Quarrying and Blasting Rocks.
Quartz Mining in California.

Mertyweather Mining Company
Methods of Searching for and Discorering

Coal Bells
Milllollan.l's Boiler
Mines, American School of.
Mines in California from which Returns

have been male
Mining Laws and Regulations : James M.

Cooper y's. Enoch C. Roberts...
Mining of Coal
Mining Statistics of Great Britain.
Mining Stock Market.

294
315
809
413
104
105

66

514

Quartz Mining in Grass Valley.
Quartz Mining Summary.
Quicksilver..

R

66

Mining Pan Manufacture.
Minnesota Mine
Minnesota Stock..
Morris Canal..
Monster Nuggets found in Victoria.
Montreal, System of....
Mount Taylor, System of..
M. W. Baldwin & Co.'s Boiler.

184
259
147
275
875
499
415
115
277

87
111
323
833
293

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Index.

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PAGB Sbafts, expense of Sinking..

3-9 Sierra Madre, System of.

230 Sierra Mog'yon, System of.

829 Sierra Nevada, System of..

832 Sierra of San Francisco, System of.

833 Silliman Bowl, The.

274 Silurian System, its Base in Massachusetts. 454 Silver-Lead and Copper Ores and their Metallurgical Treatment...

223 Silver Mines of California..

121 Silver Ores, Waste in Roasting.

123 Silver Ores, Roasting of..

856 Slate Mines of Lehigh County:

816 Smelting Apparatus to be used therein.. 101 Smelting, linprovements in..

101 Sodium and Alumininm.

817 Specimens of Natural History.

154 Spring Hill Mine...

479 Statistics of Iron Manufacture..

293 Statistics of Iron Manufacture in Cincinnati for 1955..

104 Stamps for Crushing Ores..

31 St. Lawrence System of Mountains.

322 Steel, Manufacture of..

97 Steel, Cast, New Process.

407 Stirring Bowl....

269 Stone, Coloring for.

317 Sulphurets of Iron from Quartz containing Gold in California.

414

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MINING MAGAZINE:

DEVOTED TO

Mines, Mining Operations, Metallurgy, fc., &c.

VOL. VII.-JULY & AUG., 1856.—Nos. I. & II.

ART I.-PROCESSES FOR THE DISTILLATION AND PURIFICATION

OF THE PRODUCTS OF COAL, By O. B. MANSFIELD. No.3.

[Continued from page 391, Vol. VI.]

There are other substances which may be considered as impurities, viz., naphthalıne, a solid hydrocarbon, which, when pure, boils at 212 degs., and is therefore found chiefly in the camphole, and in the first half of the dead oil. Paranaphthaline, a solid hy. drocarbon, which boils at a temperature above 300 degrees, and is therefore chiefly in the last portions of the dead oil. Besides these, the most volatile of the spirituous substances, viz., alliole, since it has an ill smell, may be considered as an impurity, when present in such benzole, as is required to be pure, all these, viz., naphthaline, paranaphthaline, and alliole, are removed by a sufficient quantity of concentrated sulphuric acid, which forms peculiar compounds with them, which it dissolves and carries with it to the bottom of the other hydro-carbonaceous spirituous substances, on which, with the exception of camphole, it acts much less powerfully.

I proceed now to the application of these facts to the purification of the different oils and spirituous substances manufactured according to the first part of my invention. If a very volatile spirit be required, which is not required to be entirely free from a slightly disagreeable smell, I take any portion of the most volatile part of the naphtha, separated according to the principles which I have set down; but I prefer to take for this purpose such as may have been distilled over, before the temperature in the retort in the second or third distillation, or in the last distilling vessel, if a complex rectifying apparatus be used, has risen above 80 deg. This spirituous substance, which I call alliole, will not be absolutely pure, being mixed with a certain portion of the benzole, but will usually be found to be characterized by the peculiar smell of the pure alliole. I add to this alliole about onefourth its bulk of a cold moderately dilute acid, for which pur. pose I prefer hydrochloric acid of specific gravity 1.16, mixed with five times its bulk of water; but a much stronger hydro

VOL. VII.-1

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