the movement being performed by gravity

Drying solid materials or objects by processes involving the application of heat > by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact > the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration > the movement being performed by gravity

Drying solid materials or objects by processes involving the application of heat (in specific machines or apparatus F26B9/00 - F26B19/00) > by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact > the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration > the movement being performed by gravity