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===Inner Knob===
===Inner Knob===
The inner knob is probably a vernier TIME/DIV control.
The inner knob is probably a vernier TIME/DIV control.
The inner knob rotates the optical disk and a precision rotary potentiometer.
The inner knob rotates the optical disk and a precision rotary potentiometer, Tektronix part number [[311-0537-01]].
Each radial position of the disk produces a pattern of light/dark in the light pipes coming out of the disk.
Each radial position of the disk produces a pattern of light/dark in the light pipes coming out of the disk.
The patterns encode vernier TIME/DIV values.
The patterns encode vernier TIME/DIV values.