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to assume its original temperature, ana the contraction of
volume caused by the melting process is determined by weighing
the remaining quantity of mercury in the cup. Afterwards b
is shut, c is opened again, and the expansion of the liquid
for every centigrade degree measured by means of the
scale-tube as before. But in this case the dilatometer needs much
more time [6 to 8 minutes] to attain a uniform temperature
throughout its whole mass than before. Therefore the time of
each observation must be considerably prolonged [20 to 25
minutes].
When the volumetric determinations are completely
finished, the instrument is taken from the mercury bath and
placed in melting snow for a couple of hours. The superfluous
mercury in the reservoir is removed, so that the dilatometer
is filled exactly to the stopcocks a and c with mercury (and
water) of 0’ C. Afterwards it is cleaned and weighed at
ordinary temperature. The mercury is collected and weighed
separately.
The results are calculated in the following way.1 From A,
B and downwards the instrument is immersed in the
mercury-bath and partakes of its variations of temperature. The volume
1 See the preceding figure.
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