A treatise on colour manufacture : a guide to the preparation, examination, and application of all the pigment colours in practical use (1908)
Zerr, Georg, Rübencamp, R. (Robert), Mayer, Charles · London : C. Griffin · leaf 81
is fed directly on to the rotating lower stone, which distributes it and causes it to pass more rapidly between the stones than is the case with a rotary upper stone. Hence, whilst grinding the material equally fine, an increased quantity can be dealt with in the same space of time. Both classes of… … touching each other, thus pre- venting sparks. The bearing is lubricated at easily accessible places by means of solid grease, which keeps out dust and dirt. The conical or spur pinion is connected with the spindle by means of a clutch coupling, which can be easily loosened when the wheel requires…
Pigments · Coloring matter · Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
