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Page 213
The sailing bird , having only the aid of the wind to support it in the air , must be built for utilizing the slightest current of air from whatever direction it comes . It is necessary also that its ...
The sailing bird , having only the aid of the wind to support it in the air , must be built for utilizing the slightest current of air from whatever direction it comes . It is necessary also that its ...
Page 262
The next windmill is opposite in direction , loose enough to whirl in the can but tight on the little shaft . The third is right handed again , firmly fixed in the can and loose on the shaft and so on till the can is full .
The next windmill is opposite in direction , loose enough to whirl in the can but tight on the little shaft . The third is right handed again , firmly fixed in the can and loose on the shaft and so on till the can is full .
Page 460
at the moment when the direction is suddenly changed . What is the What is the nature and the cause of the force which tends so strongly to resist this change of direction that , often , the whole fabric is upset or even torn to pieces ...
at the moment when the direction is suddenly changed . What is the What is the nature and the cause of the force which tends so strongly to resist this change of direction that , often , the whole fabric is upset or even torn to pieces ...
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