A scale caption should always accompany the amounl-scole numerals unless the character of the scale units is otherwise indicated.

2. Amount-scale captions should be located where they will most effectively mdicate the units of value.

TONS

I.

I..

CopMon

above

numerali

Caption at the tide

»io

RANGE AND SPACING OF TIME SCALE

1. The time scale should correspond to the characteristics of the data both in regard to the span of time covered and the frequency with which values ore recorded.

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Caption combined with numerals

RELATION OF TIME SCALE TO VERTICAL RULINGS AND PLOHED POINTS

Note: Time icale^ consist of a series of successive equally spaced points of time Idates. time of doy, etc.) ; the intervals between such points representing periods of time.

"f^INT DATA" are values in a time series as of specific points of lime "PERIOD DATA" ore volues in o time series for periods of time.

1. IN THEORY, vertical rulings should always indicate specific points of time on the time scale.

|a| Point data should be plotted on such point-of-time rulings, lb) Period data should be plotted midway between point-of-time rulings.

2. IN ACTUAL PRACTICE, however, this principle may often be disregarded in showing period data.

1 1

1 -►OiNT 0*TA* 1

|isr or c*o« MOfrral ^

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1 -«•«« 0«T»- {I |fO« MONTMJ KOTCOJI

JAN FEB MAR APR MAY JUN

Point doto on verticals. Period doto midway between

Theory followed in showlr>g period doto on verticals

GRAPHIC PRESENTATION

LOCATION OF TIME-SCALE DESIGNATIONS Principle