_THE GRINDING OF TANNING MATERIALS._
Primitive methods of grinding -- The bell mill or coffee mill -- Disc
mills -- Disintegrators -- Carr’s disintegrator -- Carter’s
disintegrator -- Adjustment of disintegrators -- The Williams
pulveriser -- Myrobalans and Valonia crushers -- Sawing mills --
Shaving mills -- Dyewood cutting machines -- Screening of ground
materials -- Hatching of bark -- Disintegrators and fire insurance --
Dust from disintegrators -- Chain conveyors -- Belt conveyors --
Vibrating conveyors PAGE 316