"metal" nach Englisch mit Beispielen - Kollokationen-Wörterbuch Englisch
- Silvered glass mirrors were a vast improvement over speculum metal and made reflectors a practical instrument.
- He started building his own reflecting telescopes and would spend up to 16 hours a day grinding and polishing the speculum metal primary mirrors.
- He chose an alloy (speculum metal) of tin and copper as the most suitable material for his objective mirror.
- It was difficult to grind the speculum metal to a regular curvature.
- For nearly 200 years speculum metal was the only mirror substance that could perform this task.
- Rapidly cooling night time air would cause stresses in large speculum metal mirrors, distorting their shape and causing them to produce poor images.
- Glass was also more thermally stable than speculum metal, allowing it to hold its shape better through temperature changes.
- But speculum metal is a material of a very intractable description.
- When completed, the disc of speculum metal was about six feet across and four inches thick.
- The poor optical quality of the early polished speculum metal mirrors meant that telescopic sights were not practical.
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