- Project Runeberg -  Through Norway with Ladies /
26

(1877) [MARC] Author: W. Mattieu Williams
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is so very much lower than those of iron or
platinum, it behaves like them as it approaches
this point, and if two pieces of ice at this
temperature are simply pressed together they become one
piece.

Every schoolboy who has played at snowballs
is familiar with this. He knows that snow,
especially when thawing, i. e. when passing from the
solid to the liquid state, is weldable, and he
squeezes the granules of ice into a coherent ball,
just as the puddler squeezes granules of
semifluid iron into a “puddle-ball” with his rabble.
By further pressure of the steam-hammer, or
“squeezer,” the puddler welds the spongy ball into
dense iron, and the snowball may be similarly
welded into compact ice if sufficient pressure is
applied. Cold iron is unweldable, so is cold ice,
i. e. ice at a temperature much below its freezing
point. Snowballing is impracticable during the
winter in Arctic regions. The snow is as
incoherent as sand. But even in the coldest regions
above the snow-line, the temperature of a deep
layer of snow rises to about the freezing point as
we descend below the surface; and thus every
deep layer of snow becomes imperfectly welded
into semi-compact and very plastic ice, especially
at its lower part. The accumulations above the

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