well-known optical tionary windmills are common enough, but a portable ish flag, which was credited with 2,900,000 tons. The Hamburg and British vessels trading with the port windmill is surely a novelty that merits more than passing notice. And a portable windmill it is that monopolize between… … flag, thirty-seven under the British, the famous English pottery manufac- A PORTABLE WINDMILL. eight under the Norwegian, six under turers of Etruria, Stoke-on-Trent, the Danish, three under the Dutch, three under the lected by a condensing lens and concentrated upon a have been engaged to make the…
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