Card dials are another form of altitude dial. Some had movable hours around the rim of a 24-hour clock dial. Sundials use some or part of the 24 hour analog dial. Each mode can be selected via a rotary control dial on the dash. The trim gauge is the only analogue dial in the cockpit. Ctesibius invented an indicator system typical for later clocks such as the dial and pointer. A tachometer was optional, and was placed in the far right dial on the dash. The Automatic Electric governor shaft was parallel to the plane of the dial. Motorists may also dial *11 on mobile phones. He has presidents on speed dial and generals at his beck and call. The degree system spaces 360 equidistant points located clockwise around the compass dial. Motorists may also dial *11 on their mobile phones. Some cameras have their hyperfocal distance marked on the focus dial. By 1979, 26% of the U.S. population could dial the number. Before Sylvia can dial 911 the busboy disappears.