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2. Kloeckner Metals Corporation - Wikipedia

   en.wikipedia.org/wiki/Kloeckner_Metals_Corporation

   Kloeckner Metals Corporation's core business is the sale of steel and non-ferrous metals. The North American subsidiary of Klöckner & Co SE , Kloeckner Metals Corporation is the fourth-largest service center company in North America with 50 locations in North America servicing 8,000 metalworking businesses in the United States , Puerto Rico ...

3. Steel frame - Wikipedia

   en.wikipedia.org/wiki/Steel_frame

   Steel frame structure Rectangular steel frame, or "perimeter frame" of the Willis building (at right) contrasted against the diagrid frame at 30 St Mary Axe (at center), in London. Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams , constructed in a rectangular grid to support the ...

4. Mirror mount - Wikipedia

   en.wikipedia.org/wiki/Mirror_mount

   Typically, the movable frame that holds the mirror pivots on a ball bearing which is set into a hole in the fixed frame. Ideally, this hole should be trihedral (pyramid-shaped). Often a conical hole is used due to easier manufacture. The frame is pivoted by means of two micrometers or fine-thread screws, tipped with steel ball bearings. One of ...

5. Steel square - Wikipedia

   en.wikipedia.org/wiki/Steel_square

   The steel square is a tool used in carpentry. Carpenters use various tools to lay out structures that are square (that is, built at accurately measured right angles ), many of which are made of steel , but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various angles .

6. Mirror - Wikipedia

   en.wikipedia.org/wiki/Mirror

   A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...

7. Silvering - Wikipedia

   en.wikipedia.org/wiki/Silvering

   In the early 10th century, the Persian scientist al-Razi described ways of silvering and gilding in a book on alchemy, [citation needed] but this was not done for the purpose of making mirrors. Tin-coated mirrors were first made in Europe in the 15th century. The thin tinfoil used to silver mirrors was known as "tain". [5]