power mower 
Motorized device using a rotating horizontal blade to cut grass over large areas.
safety handle 
Lever controlling both the blade rotation and the wheel motion.
motor 
Device converting the combustion of fuel and air into mechanical energy.
spark plug 
Instrument with electrodes that produce sparks that ignite the gaseous mixture in the motor’s combustion chamber.
casing 
Part supporting and covering a rotating blade for cutting the grass.
speed control 
Mechanism for controlling the blade’s rotation speed and the motion of the mower.
ignition key 
Part that is inserted into the ignition switch to start or stop the motor.