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Round convex mirrors called Oeil de Sorcière (French for "sorcerer's eye") were a popular luxury item from the 15th century onwards, shown in many depictions of interiors from that time. [3] With 15th century technology, it was easier to make a regular curved mirror (from blown glass) than a perfectly flat one.
An alternative chemical toughening process involves forcing a surface layer of glass at least 0.1 mm thick into compression by ion exchange of the sodium ions in the glass surface with potassium ions (which are 30% larger), by immersion of the glass into a bath of molten potassium nitrate. Chemical toughening results in increased toughness ...
Automobile windshield with "spider web" cracking typical of laminated safety glass. Laminated glass is a type of safety glass consisting of two or more layers of glass with one or more thin polymer interlayers between them which prevent the glass from breaking into large sharp pieces. [1]
Sand & Stable Aliya 58-Inch Media Console $420 $879 Save $459 The perfect piece for any aesthetic, this buffet cabinet can serve anywhere from the dining room and TV room to your home office.
A convex secondary mirror is placed just to the side of the light entering the telescope, and positioned afocally so as to send parallel light on to the tertiary. The concave tertiary mirror is positioned exactly twice as far to the side of the entering beam as was the convex secondary, and its own radius of curvature distant from the secondary.
This top-rated model heats up quickly and can fit up to two steaks, 20 wings, a 5-pound chicken or an 8-inch pizza. Plus, it can be used to dehydrate food, proof bread and even bake desserts. $87 ...
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