A whirlpool foot bath for a pedicure chair having a housing with a removable cap and a rotor and stator magnetic motor within the housing. Two substantially flat grasping zones are disposed along substantially opposite ends of the rim and the grasping zones have sufficient dimensions to permit control of the geometry of the rim and also to permit control of the horizontal positions of the two grasping zones. The opening and closure timings of the intake valves are adjustable entirely independently by electromagnetic drivers from the crankshaft position to control the amount of intake air supplied to the combustion chamber. The nose pad arms extend from the frame front in a direction that sets an offset distance between the nose bridge-contacting surfaces and the frame front to establish a vertical drop distance that allows the user rotating the frame front about the pivot axis to the near-field adjustment position to see over the top long side of the frame front. The present invention can support the compression of luminance, intensity and alpha textures.