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.

3. PLACING. Time designations should be centered under the vertical grid rulings or spaces to which they relate.

4. READING POSITION: la) Designations should, if possible, read horizontally. (b| When there is insuFTicienf space to place time designations in a

horizontol position, it is generally desirable to place them in a vertical position reading upward.

Note In some cases where it is important to retain horizontal reading it is possible to "stogoer" captions.

5. SUBDIVIDED TIME PERIODS. When major divisions on the time scale ore divided into minor divisions, it is normally desirable to indicate both, by means of primary and secondary scale designations. Major divisions should be indicated by captions placed under the minor designations to which they apply.

Note: Dropping secondory designations As a means of retaining horizontal reading, designations for minor time divisions con often be dropped entirely where interest lies in the general trend rather than in specific points on the curve, eg, for time series plotted weekly it is often sotisfactory to show only monthly captions under the weekly rulings. iSee illustration at the right I