201,405. Tolson, C. G. July 28, 1922. Variable-speed gearing upon motor vehicles is provided with means for indicating relative tooth speeds to facilitate changing speeds. Revolution counters or speed indicators a1, a2 are combined in one instrument to work two differently-coloured pointers l, l1 over a dial D, which is graduated and marked by segments or arcs of different colour so as to permit a change at sight when the pointers are in proper relative positions upon the arcs. The indicators a1, a2 are driven from the clutch and propeller shafts of the speed gear respectively, and actuate concentric spindles k2, k3 carrying the pointers. The lengths of the coloured arcs on the dial D show intervals of difference of tooth speeds within which it is practicable to make a change.
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