5 deg.
temperature (Centigrade). The gravity is then at once shown on the
divided scale in the tube, a. The lower bulb, f, contains some
mercury; e is a small glass knob, which serves to maintain the
balance, while b is an empty glass bulb (floater).
These instruments are admirably adapted for determining the gravity of
alcohol, petroleum, benzine, and every kind of oil, also for testing
beer, milk, vinegar, grape juice, lye, glycerine, urine, etc.
As the process is an exceedingly simple one and free from the
drawbacks of the araeometer, we are justified in concluding that the
araeo-picnometer will soon be in general use.
H. HENSOLDT, Ph.D.
Petrographical Laboratory, School of Mines, Columbia College.
* * * * *
[Continued from SUPPLEMENT, No. 793, page 12669.]
GASEOUS ILLUMINANTS.[1]
[Footnote: Lectures recently delivered before the Society of Arts,
London. From the _Journal_ of the Society.]
BY PROF. VIVIAN B LEWES.
IV.
Mr. Frank Livesey, in the concluding sentence of a paper read before
the Southern District Association of Gas Managers and Engineers during
the past month, on "A Ready Means of Enriching Coal Gas," speaking of
enrichment by gasolene by the Maxim-Clarke process, said "it should,
in many cases, take the place of cannel, to be replaced in its turn,
probably, by a water gas carbureted to 20 or 25 candle power.
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