Painters' colours, oils, and varnishes : a practical manual (1892)
Hurst, George H. (George Henry) · London : Charles Griffin & Company ; Philadelphia : J.B. Lippincott Co. · leaf 205
MANUFACTURE. During the whole of this operation the temperature of the fur- nace is kept at the proper heat, viz., that at which sulphur will burn, and the agitator is kept at work. 3. Muffle Method. — It is also known as the French method. In this method the green ultramarine is coloured by… … Fig. 21. — Ultramarine muffle furnace. muffle-chamber by a flued arch. The muffle, B, is made of earthenware, and is completely closed at one end, while the other is fitted with a door, D, so built into the furnace that none of the furnace gases can get into the interior of the muffle ; C is the…
Paint · Varnish and varnishing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
