Explanatory notes
… basic gear is the toothed wheel, cylinder, cone, rack or worm, etc. In an assembly of such gears, the teeth of one … cog wheels, bevel gears, conical gears, helical gears, worms, rack and pinion gears, differential gears, etc., and … of cast iron, in certain cases being covered with leather, wood, bonded fibres or other material to increase the …