Rotational indicator with mechanically adjustable reduction factor

A rotational indicator comprising:

• a mechanical reducer, the mechanical reducer comprising:
• first and second fixed shafts, the first and second fixed shafts being parallel and proximate to each other, one of the first and second fixed shafts being configured to accept a mechanical reducer rotational input;
• first and second pluralities of double gears, wherein:
• the first plurality of double gears rotatably surround the first fixed shaft and are arranged in successive axial alignment therewith;
• the second plurality of double gears rotatably surround the second fixed shaft and are arranged in successive axial alignment therewith;
• each of the double gears comprises a larger gear and a smaller gear, the smaller gear being smaller in diameter than the larger gear, wherein the larger gear axially precedes the smaller gear along the first or second fixed shaft, the larger and smaller gears being rotationally coaxial with and fixed to each other;
• all of the larger gears are mutually identical to each other, and all of the smaller gears are mutually identical to each other, a double gear reduction factor being equal to a number of teeth included in each of the larger gears divided by a number of teeth included in each of the smaller gears;
• the larger and smaller gears are configured such that the larger gear of any one of the double gears can be intermeshed with the smaller gear of any of the other double gears when brought into axially aligned proximity thereto;
• and
• the fixed shafts and double gears are arranged such that except for a last of the double gears, the smaller gear of each of the double gears surrounding the first fixed shaft is intermeshed with the larger gear of a next one of the double gears surrounding the second fixed shaft, and vice versa;
• an axially rotatable pinion shaft proximate and axially parallel with the first and second fixed shafts;
• and
• a pinion gear rotationally fixed to the pinion shaft, the pinion gear being axially translatable along the pinion shaft such that it can be engaged with any selected one of the larger gears of the double gears;
• and
• an indicating mechanism rotationally coupled to the pinion shaft and configured to provide a rotational indication according to a reduction factor applied to a rotational input of the rotational indicator.