. in the entire circuit, while in the external cir- Astronomical Notes. "the speed of ice yachts." '73736543 To the Editor of the Scientific American : cuit we shall have 36' X 4-5 X 60 X „„- „ = 4-077-f, or I am convinced your opinion is the true one. You base it moreover on facts; no doubt this… … that during the whole time of its course the boat moves MASS AS SEEN NOV. 11 1979. The Future Water Supply of Pblladelphla. through air already put in motion by the same wind. To the Editor of the Scientific American : A. O. Jupiter, not so bright as a month ago, but still a magnificent Montreal,…
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