Painters' colours, oils, and varnishes : a practical manual (1906)
Hurst, George H. (George Henry) · London : Charles Griffin & Company · leaf 112
94 WHITE PIGMENTS. sand, mica, &o., is pumped into a series of troughs of wood, generally known as launders these are long and wide; across these at intervals are placed a number of pieces of wood, called the drags," which serve to impede the flow of the water, and cause it to form a series of… … Fig. 12. — China-clay works. plenty of room for the sand to deposit. From the launders the water, with the clay and mica, passes on to what are called the " micas," an ingenious arrangement for promoting the deposition of the light and flaky pieces of mica. The micas are a series of troughs 20 feet…
Paint · Varnish and varnishing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
