Electropolis can boast of 100,000 inhabitants, and
most enterprising citizens they are. Their great idea is to work
everything by electricity, and to them belongs the credit of all
the latest discoveries in electrical science. Their beautiful
city is a great centre of attraction for scientific men, and many
European electricians make a practice of coming over every Saturday
to stay till Monday. Here are the colossal thermo-electric
batteries which work throughout the year by there being stored up
in immense solid blocks of aluminium the heat of summer and the
cold of winter. The hot blocks, which are protected in winter, are
exposed to the sun in summer, and are heated nearly to red heat by
the rays concentrated upon them by a series of large mirrors. The
cold blocks are simply exposed to the intensest cold of winter and
protected from the heat of summer. Thus two permanent extremes of
temperature are provided during the whole year, and the batteries
only require to be placed in suitable positions with regard to the
blocks to work continuously.
While speaking of cities in the far north, that of Bearville, on
the shores of Great Bear Lake, in latitude 65 degrees, must not
be passed over. Bearville is the metropolis of one of the finest
mineral districts in the world, but had it not been for the
inexhaustible deposits of all the useful metals in its vicinity,
it is probable a city would never have sprung up in such an
inhospitable region.
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