Printed or written documents, drawings, blue prints, records, maps, fabrics, small tools, machinery parts, etc., may be copied in a few minutes at the cost of a few cents.

3. In addition to copying at original size, enlargements or reductions may be made in any

desired size. If enlargements required are larger than the maximum size sheet of the Photostat used, they may be made in sections and pieced together. Transfer negatives for reproduction by other processes are easily made on this apparatus. Standard models produce, on a single sheet, prints up to 18" x 24 ".

GRAPHIC PRESENTATION

A. B. Dick Company, Chicago.

A. Mimeograph Machine.

1. MimeoKraph stencil duplicating can

reproducr large numbers of copies in black ink or colors at a low cost. This process is widely used for reproducing graphic material of many kinds.

2. When enlargement or reduction of an

original chart or graph is necessary to effect conformity with Mimeograph duplicating size limitations, Mimeograph photochemical stencils will be found useful. The photochemical stencil is frequently used where graphic structures are too complex to be conveniently drawn with a stylus on a stencil sheet.

Standard Mailing Machines Co., Everett, Maai.

B. Liquid or "Fluid" Process Duplicator.

1. The original or master copy for this duplicator is made with a "spirit" hectograph carbon in such a way that a reverse or negative impression is made. This master copy is inserted in the drum. While proceeding through the machine the copy paper is moistened with a thin film of an alcoholic duplicating fluid. When this inserted copy paper is brought in contact with the negative impression of the master copy, it dissolves sufficient dye to produce a copy. This process will make from 200 to 300 clear copies from one original.