Close, according to this
https://en.wikipedia.org/wiki/Ice_spike
as the water freezes the last remaining unfrozen spot is where the ice tower
forms.
Just think of it as nature's way of preserving your birdbath from cracking.
WayneS
At 12/20/2019 08:51 AM, Jim wrote:
>No such luck, Charlie.
>
>Brian Reid, who owns and supports the Leica Users Group site, gave the best
>suggestion. It's really about the physics of freezing of a contained
>liquid. He suggests that the surface of the bird bath froze, trapping the
>liquid below. When it continued to freeze, the expanding slush found a weak
>spot in the ice and pushed upward. To me, it is similar to what I recall
>when milk was delivered in glass bottles. In freezing weather, the freezing
>milk on the front porch would push out the cardboard cap and lift it on a
>column of frozen milk.
>
>By the way, there is a smaller one this morning, on the opposite side of the
>bird bath.
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