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Suppose, in short, the question that had torn the whole world in two was never even asked at all, until some spectacle-maker suggested it somewhere about 1750. In that case I think we should find it hard to believe that this physical difference had really played so fundamental a part in human history.
About this time the telescope was invented by Janssen, a spectacle-maker of Middleburgh, in Zealand. Hearing of it, Galileo immediately constructed his first very imperfect instrument, which magnified only three times.
From the Exchange I took a coach, and went to Turlington, the great spectacle-maker, for advice, who dissuades me from using old spectacles, but rather young ones, and do tell me that nothing can wrong my eyes more than for me to use reading-glasses, which do magnify much.
"When I reached home, I laid the pieces of the spectacles together, measured the frames very carefully, tested the left eye-glass, and wrote down a full description such as would have been given by the surgeon to the spectacle-maker. Here it is, and I will ask you to note it carefully. "'Spectacles for constant use. Steel frame, Stopford's pattern, curl sides, broad bridge with gold lining.
But on other days would begin to fall the rain, of which we had had due warning from the little barometer-figure which the spectacle-maker hung out in his doorway. Its drops, like migrating birds which fly off in a body at a given moment, would come down out of the sky in close marching order.
From the Exchange I took a coach, and went to Turlington, the great spectacle-maker, for advice, who dissuades me from using old spectacles, but rather young ones, and do tell me that nothing can wrong my eyes more than for me to use reading-glasses, which do magnify much.
His father was a great spectacle-maker. You have heard of Pacey's spectacles? 'Can't say as how I have, replied Sponge, adding, 'they are more in your line than mine. The further consideration of the youth was interrupted by the entrance of a footman with hot water, who announced that dinner would be ready in half an hour. 'Who's there coming? asked Jack.
In a very few days after this, Galileo heard that a Dutch spectacle-maker had placed certain queer-shaped pieces of glass in a tube, and offered to sell this tube to the Government, so by its use, soldiers could see the movements of an enemy many miles away. That night Galileo did not close his eyes in sleep.
But it was work of a different kind that established Galileo's popular reputation. In 1609 Galileo heard that a Dutch spectacle-maker had combined a pair of lenses so as to magnify distant objects. Working on this hint, he solved the same problem, first on paper and then in practice. So he came to make one of the first telescopes ever used in astronomy.
In the same year, 1609, Galileo heard the report that a spectacle-maker of Middleburg, in Holland, had made an instrument by which distant objects appeared nearer. He tasked his ingenuity to discover the construction, and soon succeeded in manufacturing a telescope. His telescope, however, seems to have been made on a different construction from that of the Dutch optician.
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