The weight of curves should vary according to the use -- from relatively heavy lines in charts for popular appeal to very light lines in charts used for close reading of values.

7. VARIATION OF WEIGHTS on the same chart: la) To distinguish one curve from another.

(b) To indicate the relotive importance of curves.

8. OVERLAPPING CURVES. The more curves intersect or overlap on the same grid, the greater should be the contrast in weight las well os pattern).

Curve 5 limes Curve 2 to 3 times grid rulings grid rulings

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"Total" curve 5 times grid rulings

"component" curves

2 to 3 times grid rulings . labels should be brief.

2. Labels should be of sufficient size to be easily read.

3. Labels should be placed where they will clearly identify the curves to which each relates.

4. Labels should be so placed as to assist in effecting a balanced composition.

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Definition; A key In the case of a curve chort I] o device for identifying curves by means of labeled "samples" of the curves ploced opart from the curves themselves.