If the original is made by hand (pencil or ink), a special type of carbon paper should be purchased. Best results will be obtained by using a pencil with hard lead, or a manifold pen.

Tracings in pencil or ink may be made by placing tracing paper over the copy. Thin paper can be used for small tracings, while for large ones a tracing cloth, which comes in a larger size than the paper, should be used.

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Dautco Producti Co , Nrw York City, and Oitto, Inc., Chicago.

Gelatine Process Duplicating Machines.

1. These duplicators are equipped with continuous bands or films of gelatine duplicating

material. The original or master copy may be prepared either by a typewriter or may be drawn with pen and ink or a copy pencil.

2. The process of duplicating is very simple. The master copy is placed face down on the

moistened surface of the film for two minutes. Blank sheets of paper one at a time are then put on the film from which the master copy has been removed. From 50 to 100 copies may be made from one master copy. A turn of the handle brings a new gelatine surface.

3. The machine on the right is a jjortable that can easily be carried around if necessary.

It will copy a sheet as large as 8',i by 14 inches.

430«

flRAIHIg IRII

ENTATION

A. Arc Lamp.

Today it is possible to secure a continuous blue printing, washing, developing, and drying machine with either electrically heated or gas dryer.