A converter that tapers off a 4 mA input to zero, and adds the input and the tapered off 4mA signal to create a 2-wire 4-20 mA output loop.

A 15-member commission created in 1965 by the Carnegie Corporation of New York released its report, “Public Television: A Program for Action,” on Jan. 26, 1967, popularizing the phrase “public ...

January 30, 2026 • It’s … Indicators of the Week! Our weekly look at some of the most fascinating economic numbers from the news.

For more than 160 years, the National Academies have provided nonpartisan, evidence-based advice on decisions that affect our nation. Browse the listing of projects and activities to see examples of ...

January 30, 2026 • Blue Origin, owned by billionaire Jeff Bezos, says it's stopping human spaceflights for at least two years. The move will allow it to "shift resources" to the company's lunar ...