Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 163
at this was a very longand roundabout way of weighing. Supposing, however.we had to weigh a mountain, or rather a body whichwas bigger than fifty thousand mountains, and whichwas also many millions of miles away, all sorts of expe-dients would have to be resorted to. I have told youone of them. If… … Fig. 49.—Relative Weights of Mercury and the Earth. We hardly know anything as to what the globe ofMercury may be like. We can see little or nothingof the nature of its surface. We only perceive theplanet to be a ball, brightly lighted by the sun, and wecannot satisfactorily discern permanent…
Astronomy
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