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not, senor." "Good! At last there is one fact about glass-making that I can impart to you. This sort of glass is known as sand-blast glass, and the art of making it, they say, chanced to be discovered near the seashore. It was found that when the strong winds rose and blew the sand against glass window-panes of the houses the small particles, being sharp, cut into the glass surface, and before long wore it to a cloudy white through which it was impossible to see out. Often the glass fronts of lighthouses were injured in this way and the lights dimmed. Finally some man came along who said: 'See here! Why not turn this grinding effect of the sand to some purpose? Why not apply it to transparent glass and make it frosted so one can get light but not see through it? Often such glass would be a convenience.' Therefore this inventor set his brain to the task. Strong currents or streams of sand were directed against a clear glass surface with such force that they cut and ground it until it was no longer transparent. They called the product thus made sand-blast glass. Later they improved upon it by laying a stencil over it so that a desired design was covered and remained protected from the sand blast. The result was a pattern such as you see--clear figures set in a background of clouded glass." "How interesting!" "Yes, isn't it? As is true of so many other of our most clever inventions nature first showed man the path. Ground glass in its modified forms is used for many purposes now; and yet I venture to say few persons know how it came to be discovered." Just at this point the car stopped with a sudden jerk, and beckoning Jean and Giusippe to follow, Mr. Cabot got out and entered a large brick building that stood close at hand. Evidently he was expected, for a man came forward to greet him. "Mr. Cabot?" he asked. "Yes. I received your note this morning, so I brought my young charges out at once. It is very good of you to allow us to go through the factory." "We are always glad to see visitors. I will put you in the hands of one of our foremen who will take you about and tell you everything you may want to know." He touched a bell. "Show Mr. Cabot and his friends down-stairs," said he to the boy who answered his call, "and introduce them to Mr. Wyman. Tell him he is to conduct them over the works." Mr. Wyman welcomed them cordially. "We see many visitors here, sir," said he, "and are always glad to h
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