I have been in the business of working for companies that make computer chips for more than 25 years.
Making a chip is a combination of the old darkroom enlargers and painting a car. You take a flat piece of silicon, which is pure glass, put photo resist chemical on, shoot light through a negative. The reaction to the light makes the chemical react, you wash that off leaving a mask on the silicon, like masking a car. You then spray on a layer of molecules, like painting a car. This process is repeated until you have the appropriate layers of molecules on to make a computer chip. There can be several hundred chips on one wafer, the chips are then tested, and cut off to make individuals. The chips are graded, with the best ones being the faster chips, a lot like sorting gravel by size.
The new wafers are 18 inches in diameter and built with an accuracy of 15 nano meters, when I started they were 4 inches in diameter and 10 micro meters.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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