MATERIAL COLOUR

Cast iron Payne's grey or neutral tint.

Wrought iron Prussian blue.

Steel Purple (mixture of Prussian blue and crimson lake).

Brass Gamboge with a little sienna or a very little red

added.

Copper A mixture of crimson lake and gamboge, the former

colour predominating.

Lead Light Indian ink with a very little indigo added.

Brickwork Crimson lake and burnt sienna.

Firebrick Yellow and Vandyke brown.

Greystones Light sepia or pale Indian ink, with a little

Prussian blue added.

Brown freestone Mixture of pale Indian ink, burnt sienna, and

carmine.

Soft woods For ground work, pale tint of sienna.

Hard woods For ground work, pale tint of sienna with a little

red added.

For graining woods use darker tint with a greater

proportion of red.

_Printing._--A good drawing should have its title printed, a plain style

of letter being used for this purpose, such as the following:--

[Illustration: ABCDEFGHIJKLMNOPQRST

UVWXYZ

1234567890]

[Illustration: ABCDEFGHIJKLMNOPQR

STUVWXYZ

1234567890]

The following letters look well _if they are well made_, but they are

much more difficult to draw.

[Illustration: ABCDEFGHIJKLMNOP

QRSTUVWXYZ

1234567890]

An Introduction to Machine Drawing and Design · 第 9 / 48 题