Although the amount scale should generally be continuous, it is sometimes permissible to omit on intermediate portion 111 when the curves on the grid ore widely seporoted and it is desired to compare them more closely, or (2| to magnify the fluctuations of the different curves which may be widely separated on the amount scale.

6. INDICATING BROKEN SCALE. When there is any break in the amount scale or any intermediate portion is omitted, the fact should be clearly indicated by some accepted convention.

7. SPACING BROKEN SCALE When the amount scale is broken, spacing in both resulting portions of the scale should remain identical.

Ploclng the curve

Method of showing "freok" values

Division of amount scale

^H

Breaking amount scale (Se« procedures 6 and 7)

GRAPHIC PRESENTATION

LOCATION OF AMOUNT-SCALE DESIGNATIONS

Principle

1. Amouni-scole designations iiiould be ploced where they con be read most easily in coniunction with the curves.

Procedures

1. AT BOTH SIDES: In general

la) To provide for any reading requirement.

(b) To give balance to the chart.

Especially

Ic) When the grid is extremely wide.

Idl When the horizontal rulings are dose together.

2. AT RIGHT SIDE OF GRID ONLY:

lal When interest is definitely centered of the right, (bl When a noturol reading of the chart requires reading the curve before the scale.

Noie The theory of plocing 'he scole oi the right is ihoi o oerson will normolly read the chort trom let' to right (thoi is. from the curve to the scole ro'her thon (rcn 'he scole lo the cu'vel.