Now that's a GADGET.
A vernier dial with a GEARSHIFT. This was intended for homebrew builders; I don't think it was ever used on a commercial radio. Too bad! Would have been endless fun.
The idea has resurfaced in digital controls like sliders. It's tremendously useful in graphics where you need to make BIG and small moves with the same dial, or in audio where you sometimes want to jump by one second and sometimes by a minute. If the control is set for fine, you're constantly whipping the mouse back and forth. If set for coarse, you can't locate anything.
A smart slider starts with fine and accelerates to broad.
Labels: Alternate universe