This week's "Ask Kelly" segment answers a very timely question."How old is the clock at the South Park Fairgrounds?" Pittsburgh's Action News 4 viewer Bob Camella asked. "Also, what powers it? And what does it take to adjust the time, like when daylight savings time happens?"The clock at the fairgrounds has been running since the late 1940s. With the recent time change, Allegheny County officials invited us to check it out."Oh, people ask about the clock all the time," County Executive Rich Fitzgerald said. "You know, like to know when it was put in, the history of it."Fitzgerald is a bit of a history buff. He says he fields questions all the time about the clock at the county's second-largest park."This is a pretty famous clock. People do recognize this. It's been here for 75 years," he said.Back when county fairs were bustling, the clock was originally put in by local jeweler Max Unger in 1948. He eventually wanted to donate the clock to the county, but that came with controversy. Because the Unger name was on the clock, the county thought it was too much of an advertisement.After some back and forth, Unger agreed in 1960 to remove his name and the county took over, making it the official timekeeper of the popular county fair."President (Harry) Truman made a visit here, showing again the importance of southwestern Pennsylvania in electoral politics for presidents," Fitzgerald said.Today, the clock is 100% maintained by the county.Andy Schmidt, a county electrician, explained how he can change the electric motor."It's a special motor that can be controlled and run at a normal speed, or I can advance it to run at 10 times speed so it advances a format about every six seconds," Schmidt said.That's exactly what he does for the change to daylight saving time."It changes the voltage in the motor, just to make it turn faster, and then whenever it's set to the right time, you just switch it back to normal and it runs on normal speed," he said.That's also how they handle power outages. And when it's time to "fall back" at the end of daylight saving time, they turn the clock off for an hour and let it catch up.With its unique history, the clock served as the backdrop for many county fairs. They discontinued in 2001, but the clock is an icon that has stood the test of time in South Park."It becomes kind of a touchstone for people that have seen this clock as kids," Fitzgerald said. "They come back, and they show their kids and their grandkids."Soon, the clock will no longer run on electricity. In about a year or two, Fitzgerald said it will be powered by the hydroelectric plant that is being built at the Emsworth Locks and Dam.