the chart in balancing the weight ol the composition.

2. SOMETIMES AT TOP AND BOHOM-- (al When the grid is unusually high.

(bl When the vertical rulings are so numerous as to cause difficulty

in following them to the scole at the bottpm. Icl When a considerable portion of the curve lies near the top of the

grid.

3. AT TOP ONLY, IN SPECIAL CASES--

la) When it is desired to emphasize the time periods in conjunction

with the title, lb) When the space at the bottom is insufficient. |c) When the principal line of reference lies near the top of the grid.

4. WITHIN THE GRID. In very simple charts it is sometimes effectiveto place time designations within the grid directly under or over the plotted points. (This treofment is well suited to advertising or publicity charts, especially when the curve is shown without grid lines.)

1932 1933 1934 1935 1936

1925 1926 1927 1928 1929

Usual location of time-scale designation

Procedure for unusual coses

STANDARDS FOR TIME SERIES CHARTS

ARRANGEMENT OF TIME-SCAIE DESIGNATIONS

l»2S l»M IMT ins l«2« WM It3l W33

Arrong«menl for yoort

1930 1931 1932 1933 1934 1935

Arrongemenl for quarters

Principle

I. Time-scale designations should be so arranged as to focilitote the reading of time values lor all plotted points on the curves.

Procedures

1. DESIGNATION FOR EACH RULING. A time designation should normally accompany each vertical ruling.

2. OMISSION OF DESIGNATIONS. When vertical rulings ore so numerous that designations cannot be shown in legible size lor each ruling, it is well to omit some of them; e.g., every other ruling.