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Welding for Ultrahigh Vacuum

April is National Welding Month, a time dedicated to highlighting accomplishments in this important field. At NIST in the 1960s, Ralph Orwick of the NIST

Measuring Acceleration with Light

Most people have never seen an accelerometer -- a device that measures change in velocity -- and wouldn’t know where to look. Yet accelerometers have become

A Standard for Lighting Color Preference?

One of the goals of artificial lighting is to make things look natural. White light can make an otherwise appetizing sandwich look like garbage, if the reds

Making Sure that Lumber Measures Up

For some, it is a shocking revelation. But most Americans eventually come to accept the fact that a “two by four” board is actually 1.5 inches by 3.5 inches (38