Choice of the form in which material will be best presented, while an important step, is not always the first or last step. The following chapters will show

Bausch 6t Lomb Optical Co., Rochester, N. Y.

A Reducing Glass.

1. The diameter of this glass is three inches. It will reduce in the ratio of about two to

one. The reducing glass is made with a double concave lens of white ophthalmic glass, protected by a wide chromium rim.

2. A criterion in reducing an illustration might be that an area measuring about 3 " x 6 "

is about all the eye can hold at one time.

In planning page lay-outs, a reducing glass may be used to determine whether reduction to fit a given space will cause loss of detail. It is possible to sec how an illustration will appear when it is reduced by adjusting the distance between the illustration and the glass until the correct ratio between the original and the reduced image is obtained.

PREPARATION OF ILLUSTRATIONS

some of the problems involved in the actual presentation of the chart.

When presenting material in a pamphlet or book, it is possible and sometimes a good policy to use only graphic charts. Illustrations of other types may be included and many times should be included. The choice of illustrations will depend upon a number of factors. The material to be presented will be the most important criteria.

E W, Pikr S Company Cranford N J

SCALE 8