Abstract: A backpack blower has a lightweight engine, a starter, a fuel tank, a fan, a frame for the engine, two hollow tubes, and a control mechanism upon one tube. The blower improvement comes from a housing and two elbows. The round housing contains the fan and has two tangential outlets. The two elbows have a generally round cross section and a generally right angle shape. On each elbow, the first end connects with an outlet and the second end joins a tube. The elbows rotate and bend, directing leaves and debris with airflow from the tubes.

Abstract: A safety circuit is provided for parallel connected electrical loads. The headlight circuit of an automobile or other vehicle is an important application for the circuit. In the circuit a reversely polled control rectifier is in a parallel conductor subcircuit to the bright lamp filament of the headlight. The gate of the control rectifier is connected to a conductor of the dim lamp filament of the headlight. The control rectifier presents an open circuit when both of the lamps are operable but is adapted to connect the bright lamp filament through a resistor and a diode when the dim lamp filament of the headlight fails.