Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3758Chemical news office., 1932 |
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Strona 260
... 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 disc of such huge proportions , the glass manufacturers ...
... 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 disc of such huge proportions , the glass manufacturers ...
Strona 261
disc 61 inches in diameter , the mould was enlarged , modifications introduced in the procedure , and a pouring of borosilicate glass was made in May , 1927 , which resulted in a disc of glass 70 inches in diameter . To assure the ...
disc 61 inches in diameter , the mould was enlarged , modifications introduced in the procedure , and a pouring of borosilicate glass was made in May , 1927 , which resulted in a disc of glass 70 inches in diameter . To assure 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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