We had an icebox when I was a kid.
We would put a large square card in the window ——the poundage you wanted would show on the top of the card,and you would turn it if you wanted another size.
It would melt into an ice pan under the icebox.
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My grandmother grew up with iceboxes, and never learned to say ‘refrigerator’. I was in my thirties before I realized that people looked puzzled when I said ‘it’s in the ice box’. Even now I sometimes slip, and people think I mean the freezer.