Abstract: Eyewear configured to retain a hat on a wearer's head is described herein. In one aspect, eyewear includes spectacles configured to be worn over eyes of a wearer. The eyewear also includes an elastic headband configured to fit around a head of the wearer. The elastic headband is attached to the spectacles. The eyewear includes two or more headgear retention devices attached to the headband and configured to be removably attached to a hat when the hat is worn on the head of the wearer and the headband is worn around the head of the wearer.

Abstract: Apparatus for applying power to at least two heater filaments of two glow plugs in a diesel engine, or to a heater of one glow plug and a ballast load having substantially the same maximum rated voltage as the filament, is disclosed. The power source has a supply voltage greater than the maximum rated voltage of the filament and sufficiently high to cause an overheating temperature capable of burning out the filament under continuous operation. A switch is operable in a first position to prevent the application of the supply voltage to the apparatus, operable in a second position to apply the supply voltage to the apparatus, and operable in a third position to maintain the condition of the second position and to apply the supply voltage to the apparatus and to a starter for the engine.