Fig. 202. Fig. 203. The screw thread for small bolts is represented by thick and thin lines, such as was shown in Figure 152, but in larger sizes; the angles of the thread also are drawn in, as in Figure 202, and the method of doing th... Read more of Screw Threads And Spirals at How to Draw.caInformational Site Network Informational
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Blue Verditer

or Verditer, is an oxide of copper, formed by precipitating nitrate of
copper with lime. It is of a beautiful light blue colour, little
affected by light, but greened and ultimately blackened by time, damp,
and impure air--changes which ensue even more rapidly in oil than in
water. It is mostly confined to distemper painting and paper-staining.

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