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Tempering was usually performed by slowly, evenly overheating the metal, as judged by the color, and then immediately cooling, either in open air or by immersing it in water. This produced much the same effect as heating at the proper temperature for the right amount of time, and avoided embrittlement by tempering within a short time period.
Bluing, sometimes spelled as blueing, is a passivation process in which steel is partially protected against rust using a black oxide coating. It is named after the blue-black appearance of the resulting protective finish.
The Hubley Manufacturing Company was first incorporated in 1894 in Lancaster, Pennsylvania by John Hubley. The first Hubley toys appeared in 1909 and were made of cast-iron, with themes that ranged from horse-drawn vehicles and different breeds of dogs, to tractors, steam shovels and guns. [1]
The metals involved in a bimetallic strip can vary in composition so long as their thermal expansion coefficients differ. The metal of lower thermal expansion coefficient is sometimes called the passive metal, while the other is called the active metal. Copper, steel, brass, iron, and nickel are commonly used metals in bimetallic strips. [6]
Gaskets used to create an RF-tight (resistant to radio frequency leakage) seal, the electronic seal on doors used with EMC testing, and anechoic chambers. In the 1980s, beryllium copper was used in the manufacture of golf clubs, particularly wedges and putters. Though some golfers prefer the feel of beryllium copper club heads, regulatory ...
The CMYK color model is based on the CMY color model, which omits the black ink. However, the imperfect black generated by mixing commercially practical cyan, magenta, and yellow inks is unsatisfactory, so four-color printing uses black ink in addition to the subtractive primaries. Common reasons for using black ink include: [2]
2, but this reaction is accelerated by minute amounts of transition metal salts. [48] Because it can reduce the salts to the metal, potassium is often used as the reductant in the preparation of finely divided metals from their salts by the Rieke method. [49] Illustrative is the preparation of magnesium: MgCl 2 + 2 K → Mg + 2 KCl
An RCA Victor Color TV ad featuring milliner Lilly Daché in 1959. Color television (American English) or colour television (Commonwealth English) is a television transmission technology that includes color information for the picture, so the video image can be displayed in color on the television set.