Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 276
bythe observatory clock in Washington. The variations in the clocks are due mainlyto changes in temperature and to the conditionof the atmosphere, so a careful record is kept, asthe time is sent out, of the atmospheric condi-tions. One important reason for this is foundin the fact that it may be… … THE OBSERVATORY CLOCK THAT TICKS A MESSAGE FROM A STAR. 206 HOW WE SET OUR WATCHES BY A STAR. the allowances may be made for the variationin the clock, though, of course, the only abso-lutely accurate test is the silent motion of a starmillions upon millions of miles away. Other lands besides our…
Children's literature
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