Painters' colours, oils, and varnishes : a practical manual (1892)
Hurst, George H. (George Henry) · London : Charles Griffin & Company ; Philadelphia : J.B. Lippincott Co. · leaf 98
82 WHITE PIGMENTS. When a deposit of china clay has been found, the overburden is removed and usually two shafts are sunk ; one of these is as close as possible to the edge of the deposit and is known as the permanent shaft, the other is sunk in the centre of the deposit and is known as the "… … Fig. 11. — China-clay works. drift is dug to the centre of the deposit and the centre shaft dug out from the bottom ; in any case, whether the rise is sunk from above or dug out from below, a drift or horizontal shaft connects it with the permanent shaft. The size of these shafts varies in…
Paint · Varnish and varnishing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-47-13.webp)
