The copper wax mold is the least expensive of the three.

3. Stereotypes are plates made by pouring melted type metal into a paper mold called a

"mat."

Wotman illustration board is available at almost any art supply house in the following four surfaces:

1. Hot-pressed -- pen and ink drawings, water colors, and pastelles.

2. Cold-pressed -- water colors and pastelles. Pen and ink may be used, but best results are obtained on hot-pressed.

3. No. 1 Rough Surface -- rough illustrations.

4. Rough -- drawings where detail is not essential, such as landscaping.

GRAPHIC PRESENTATION

Charles T. Bainbridge and Sons, Brooklyn, New York, make a Coquille Bristol that may be used in the same way as the board illustrated in 420A. This company also makes an illustration board for general artwork and a board that is used for work requiring fine detailed drawings. Samples may be secured upon request.

Sunray scratchboard, handled by the Steiner Paper Company, New York City, may also be used in the same way as the board illustrated in 420A.

Chicago Cardboard Company, Chicago, Illinois, manufactures a colored art poster board calendered so that both lettering and printing may be done on it.

REFERENCES

Wallace, C. E., Commercial Art, McGraw-Hill Book Co., Inc., New York City, 2nd edition, 1939.

U. 8. Drpartnicnt of Afirirulturr, Bureau of Agricultural Economic*.

A Series of Density Distinctions.

1. These cross -hatchings were made on sheets of paper by the Bureau of Agricultural

Economics. It is possible for any individual using a great many hachures and desiring a large variety, to design several and have sheets of them printed.