A huge mirror which took nearly a year to cool down, has Ken made in America for a large reflecting telescope. Weighing more than a ton and a half, it is 69 inches in diameter and ten inches thick. Discs_ or glass of"this great size are very difficult to act free from defects, and after the'molten glass is poured into the mould it has to be kept hot bv electric heaters and cooled down-over a period of'many months,
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Bibliographic details
Gisborne Times, Volume LXIX, Issue 10908, 28 May 1929, Page 5
Word Count
78Page 5 Advertisements Column 4 Gisborne Times, Volume LXIX, Issue 10908, 28 May 1929, Page 5
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