This old tachometer uses music box type reeds to measure motor RPM without electricity. It's more useful than a digital Tach because it shows you resonant frequencies and can be used to check hammer and reciprocal speeds too.
This is a pretty neat device, after watching this video this weekend. They still make them but they are enormously expensive due to the limited demand and the cost of manufacture.
Martin Luther King Jr was not a popular man. In 1963, just 41 percent of Americans expressed a positive view of him. Only Soviet leader Nikita Khrushchev was more unpopular. It went downhill from there. By 1966, two-thirds of Americans held a negative view of King. In his remaining years, King polled worse than nearly all other well-known Americans. Worse than Ted Kennedy would after Chappaquiddick. Worse than Haldeman and Ehrlichman would during Watergate. Even French president Charles de Gaulle failed to provoke the same hostility as King.
