Both American Slide Chart/Perrygraf and Datalizer Slide Charts remain in business as of 2012. The Ohmite Manufacturing Company, established in 1925, sold rheostats, fixed resistors, and adjustable ...

HARRISBURG, Pa. (WHTM) — Truth be told, most of us probably never thought much about slide charts and wheel charts, much less what it would take to be certified the world’s top collector of them.

Dale Rupert of Dauphin County has been collecting wheel and slide charts for the last 23 years and now holds the world record for his impressive collection. Since 2002, Rupert has been collecting ...

Sometimes the best chart is no chart at all. If a certain figure conveys your key message most clearly on its own, show just that number — huge — on the slide. Adapted from the HBR Guide to ...