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

6. DESIGNATION FOR EACH PLOHING. For series containing irregular time intervals, it is sometimes effective to designate on the time scale only those points for which there ore plotted values.

7. TIME-SCALE CAPTIONS. If necessary to on understanding of time . Arrongemenl for weeks

. . ■ .. I J ■ • . •• L ij u I _i (Oindicotes beginning ond end ot

characteristics of a series, a descriptive caption should be placed ^ montt»i)

below the time designation; e.g., "end of each month."

■

1933 1934

Arrongemenl for monlhi

JAN ^ r(B 0 t^AII 0 API! 0 .lUN 0

GRAPHIC PRESENTATION

ABBREVIATION OF TIME-SCALE DESIGNATIONS

SUN MON TUE WED THU FRI SAT

Abbreviations for days of the week

JAN FEB MAR APR MAY JUN

JUL AUG SEP OCT NOV DEC Abbreviations for months of the year

I I I I I I

Principles

1. It is desirable to abbreviate time designations whenever the complete designations v^ould be too crowded or require o size of lettering too small to be legible.