Thus, ruled forms specially designed to suit current needs can be quickly and economically produced on the Mimeograph duplicator.

2. Triangle guides, beam compasses, and

circle guides, manufactured especially for the preparation of Mimeograph stencils, are also available.

A. B. Dirk Company, Chicago.

Lithoprint Company of New York. Inc.

B. Two Steps in the Lithoprint Process.

The lithoprint process is a simplified form of lithography. A plate coated with special composition replaces the lithographer's stone and the copy is obtained by a simple process of contact printing. Lithoprint reproductions duplicate the original drawings.

METHODS OF REPRODUCING

AddmsoKraph-Multigraph Corp., Cleveland. Ohio.

A Multilith Plate for Use in a Multilith Machine.

1. The Multilith process is "offset" in miniature. The paper-thin Multilith plates may be

placed in the typewriter. By using a special typewriter ribbon, typing can be done on the plate just as it is done on paper. Writing, lettering, or drawing may be done directly on the plate with a special type of crayon having a grease content.

2. However, the photographic method of transferring an image from the copy to the plate

is usually used. The photographic film is placed in contact with a sensitized Multilith plate and the negative image is "burned into" the plate by exposure to light.

REFERENCES

Binkley, Robert C, Manual on Methods of Reproducing Research Materials, Edwards Brothers, Inc., Ann Arbor, Michigan, 1936.

Colton Press, New York, N. Y., Production Yearbook, Volumes 3, 4, and 5, 1937, 1938, 1939.

Chapter 51 METHODS OF PRINTING