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between I.0280 and I.0150 this was tolerably easy, because the
areometer was at my disposal, but for the numbers of lower
spec, weight, the case looked somewhat doubtful, as the
instrument had been lost during the voyage.
From the collection of the Vega I selected 3 hermetically
sealed water-samples, the specific weight of which had been
tested during the expedition with the areometers. By means
of the Sprengel pycnometer I ascertained their spec, gravity
at ^ C.
Spec. gr. Spec, gravity
Date. Depth. Temp. (areometer). (Sprengel pycn.). Diff.
1878 6& 7 Sept, 12 M. — 1°.3 C 1.0238 1.02440 at ^pC O.00060
1878 25 Aug. 1-1 » + 2°.3 C I.0146 l.oi487 » » » O.00027
1878 26 Aug. 5 » + 1°,5 C I.0104 1.01040 » » » 0.
I next proceeded to the examination of the areometer. I
prepared 2 samples of salt-water by diluting sea-water from
Beeren Island of 1.02829 sp. gr. with distilled water. The third
sample is a solution of NaCl in water used by Mr. Aderman
as standard by the determinations of the point I.0150 at 3^^; C
on his areometers. The spec, weight of the solutions was
ascertained on the same occasion with the Sprengel
pycnometer at C. The result of the comparison was
Spec. gr. Spec, gravity
Temp. (areometer). (Sprengel pycn.). Diff.
0°.26 C 1.0250 1.02548 at C 0.00048
+ 0°.ll C 1.0182 1.01862 » » » 0.00042
+ 2°.l C 1.0158 1.01603 » » ’■> 0.00023
The corrections, which can be deduced from both series
of experiments, agree tolerably well. In order to supply the
numbers still wanting, I made some determinations with the
standard areometer of Mr. Aderman, which had served as
controlling instrument in the fabrication of the Vega
areometers, thereby assisted by Mr. Aderman himself. The
following table of corrections is constructed by means of these
experiments.
In order to obtain the true specific weights at qjjo C from
the areometric determinations registered in the Vega journal,
I have added
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