Motor vehicle revolution rate meter - has additional variable display unit consisting of disc visible through scale card window

摘要

A revolution rate measurement arrangement for motor vehicles contains an indicator (3) rotating about an axle in front of a scale card and an indicator for a further variable. The arrangement enables the rapid and simple evaluation of the latter. The scale card contains a window through which is viewed a disc placed parallel to and behind the cars and able to rotate about an axis. The disc carries markings at the distance of the window from its axis. The disc and the indicator rotate about the same axis, and the disc may be rigidly coupled to the indicator. The markings can be coloured strips of widths varying oppositely with length and visible through the window.