Harper's Magazine, 175권Lee Foster Hartman, Frederick Lewis Allen Harper & Brothers, 1937 Important American periodical dating back to 1850. |
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635 페이지
... glass should cost less than twenty cents . Yet measured in terms of value to the human race , glass is one of the most valu- able substances we have , and is worth far more than any jewel ever discovered . When the physicists and ...
... glass should cost less than twenty cents . Yet measured in terms of value to the human race , glass is one of the most valu- able substances we have , and is worth far more than any jewel ever discovered . When the physicists and ...
637 페이지
... glass- ware must go if it is to be freed from the strains which are set up when it cools . If a chunk of hot glass be left to cool by itself , the outside cools and hardens first and compresses the warmer inner portions . Such internal ...
... glass- ware must go if it is to be freed from the strains which are set up when it cools . If a chunk of hot glass be left to cool by itself , the outside cools and hardens first and compresses the warmer inner portions . Such internal ...
639 페이지
... glass give it a high polish . A simple lens made from a single piece of glass will not produce a very sharp image , but by putting together lenses of different shapes made of different kinds of glass physicists have developed hun- dreds ...
... glass give it a high polish . A simple lens made from a single piece of glass will not produce a very sharp image , but by putting together lenses of different shapes made of different kinds of glass physicists have developed hun- dreds ...
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