tandem disc harrow
Device with four disc trains arranged in two opposing V patterns; it loosens the soil that has already been plowed and eliminates weeds.
draw bar hitch 
Device that secures the tandem disc harrow to the tractor’s towing hitch.
hydraulic hose 
Tube connected to the tractor’s hydraulic coupler that uses a fluid (oil) to transmit power from the engine to the device’s mechanisms.
disc 
Dish-shaped part that breaks up clods of earth.
height adjustment 
Crank for adjusting the depth of the discs’ penetration into the soil.
frame 
Tandem disc harrow’s metal structure.
disc arm 
Metal structure to which the discs are attached.