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 A. Illuminaied Hand Magnifiers.

Any nnagnificr may be used to secure an idea of the appearance of an illustration when jt IS enlarged. The same method suggested in 410 may be used for this also.

SIZE OF COPY

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SIZE OF

*^ FINISMED CUT

B. Scaling Copy.

Since the ori^mal drawing or photograph seldom fits the allotted space, it is necessary to "scale the copy," that is, to figure out the height and width it will be when one side is reduced or lengthened.

A diagonal line drawn from corner to opposite corner will be the diagonal of a larger or smaller illustration made from that copy. Use a tissue overlay paper for drawing the diagonal.

A slide rule is also a useful device to determine the reduction of a photograph or drawing.

GRAPHIC PRESENTATION

A photograph which is to be printed or reproduced should never be rolled. If it is absolutely necessary, roll the photograph with the picture outside. Then if the surface should crack the cracks may close up when the photograph is flattened out.