What device is NOT typically used to smooth a field?

Mowers are primarily designed for cutting grass to maintain an even height and a tidy appearance on the field. While a well-maintained field does benefit from regular mowing, this process does not specifically focus on smoothing the surface of the field itself. Smoothing a field generally involves leveling the soil and ensuring an even playing surface, which is not the primary function of a mower.

In contrast, rakes are used to remove debris and even out the surface; screens help in filtering and leveling out the soil; and drags are specifically designed to spread material and create a smoother surface. Thus, mowers do not fit into the category of devices typically used to smooth a field.