Abstract
When the great Copernicus had revived the true system of the world, it was objected against it, that the planet Venus ought to be seen with different phases like the moon; to which he answered, that some time or another that very thing would perhaps come to pass. Who then would have thought, that this prophecy was so near being fulfilled, and that, by means of combining a convex and a concave glass, the common uses of which had been known for near 300 years before, the sight of man was to be extended almost to the remotest parts of the universe? This instrument, with nothing but its being so common hinders us from regarding with the greatest wonder, was invented, about 170 years ago, by one of those happy accidents, to which we owe many of the finest discoveries.
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