John E Karlin "Father of Human Factors Engineering" dies

Core77 design 11 February 2013

You may not know his name, but you know his work. John E. Karlin, who passed away in late January, essentially invented the touch-tone keypad. We take that ubiquitous input device for granted—it's on everything from cell phones to alarm systems to microwave ovens—but there was a time when that interface didn't exist, and no one knew what the "correct" design for quickly inputting numbers ought to be.

An industrial psychologist, Karlin was working for Bell Labs (AT&T's R&D department) in the 1940s when he convinced them to start a dedicated human factors department. By 1951 he himself was the director of Human Factors Engineering. In the late 1950s they sought a faster alternative to rotary dialing, and Karlin and his group developed the configuration we know so well today.

Forming the department and working on the keypad wasn't the only thing Karlin did, of course. The Times, who refer to Karlin as "widely considered the father of human-factors engineering in American industry," relates an amusing story of an earlier project--one that demonstrates his keen understanding of human behavior:

An early experiment involved the telephone cord. In the postwar years, the copper used inside the cords remained scarce. Telephone company executives wondered whether the standard cord, then about three feet long, might be shortened. Mr. Karlin's staff stole into colleagues' offices every three days and covertly shortened their phone cords, an inch at time. No one noticed, they found, until the cords had lost an entire foot. From then on, phones came with shorter cords.

Super Bowl blackout was caused by electrical relay

San Francisco Chronicle 8 February 2013 by Kevin McGill

The power failure cut lights to about half of the stadium, halting play and interrupting the nation's most-watched sporting event for 34 minutes.

The company that supplied electricity to the Super Bowl says the blackout that halted the big game was caused by a device it installed specially to prevent a power failure.

But the utility stopped short of taking all the blame and said Friday that it was looking into whether the electrical relay at fault had a design flaw or a manufacturing defect.

The relay had been installed as part of a project begun in 2011 to upgrade the electrical system serving the Superdome in anticipation of the championship game. The equipment was supposed to guard against problems in the cable that links the power grid with lines that go into the stadium.

"The purpose of it was to provide a newer, more advanced type of protection for the Superdome," Dennis Dawsey, an executive with Entergy Corp., told members of the City Council. Entergy is the parent company of Entergy New Orleans, the city's main electric utility.

"If higher settings had been applied, the equipment would not have disconnected the power," said Michael J.S. Edmonds, vice president of strategic solutions for S&C.

In a follow-up statement, Entergy said that tests conducted by S&C and Entergy on the two relays at the Superdome showed that one worked as expected, the other did not.

Shabab Mehraeen, an assistant professor of electrical engineering at Louisiana State University, said relays are common electrical fixtures in businesses and massive facilities such as the Superdome.

"They are designed to keep a problem they sense from becoming something bigger, like a fire or catastrophic event," he said.

"It's not unusual for them to have problems," Mehraeen said. "They can be unpredictable, despite national testing standards recommended by manufacturers."

It was reported that that the power being drawn at the time of the failure was only two-thirds of capacity.