Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3758Chemical news office., 1932 |
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Strona 260
... glass manufacturers were consulted in efforts to obtain such a disc as would be suitable for astronomical purposes , and to be not less than 61 - inchs in diameter . After carefully considering the difficulties involved in cast- ing a glass ...
... glass manufacturers were consulted in efforts to obtain such a disc as would be suitable for astronomical purposes , and to be not less than 61 - inchs in diameter . After carefully considering the difficulties involved in cast- ing a glass ...
Strona 261
... glass was made in May , 1927 , which resulted in a disc of glass 70 inches in diameter . To assure the perfect annealing so necessary in optical glass making , the huge disc was allowed to cool so slowly that eight months elapsed before ...
... glass was made in May , 1927 , which resulted in a disc of glass 70 inches in diameter . To assure the perfect annealing so necessary in optical glass making , the huge disc was allowed to cool so slowly that eight months elapsed before ...
Strona 265
... glass , 1.5 per cent . crockery , 0.7 per cent . metals , and 2.0 per cent . other material . VALUABLE DEPOSITS OF SALT IN MARITIME PROVINCES , CANADA . It has long been believed that valuable deposits of salt occur in the strata of the ...
... glass , 1.5 per cent . crockery , 0.7 per cent . metals , and 2.0 per cent . other material . VALUABLE DEPOSITS OF SALT IN MARITIME PROVINCES , CANADA . It has long been believed that valuable deposits of salt occur in the strata of the ...
Spis treści
The Story of the Perkins Reflector | 260 |
Decline in U S Phosphates Output | 266 |
Mohlers Test for Benzoic Acid Edward T Illing B Sc F I C | 269 |
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