MIL-M-18012B
and numerals on instruments and indicators
distinctly indicate the graduation to which
shall conform to MS33558.
each applies.
3.1.2 Control panels.
3.1.1 Instruments and indicators.
3.1.2.1 Letter design. The recommended
(a) Numerals on dish of instruments
letter form is shown on figure 1. This font is
whose graduations are on the
available for paste-up layout work, in double
perimeter of the dial shall be
the specified sizes, as Artype S-274. The
within the inner perimeter of the
letter designs shows in MS33558 are accept-
graduations. Numerals on sub-
able for parts covered by this specification.
dials and dials having arc-type
The following commercial fonts having the
scales with graduations not on
size ratios specified herein for the classes and
the perimeter of the dial may be
types of control panels coverered by this speci-
on the outer perimeter of the
fication may be used. Stroke width of en-
graduations, unless otherwise
graved letters shall be the same as that of
specified by the procuring ac-
the acceptable type fonts of the same letter
tivity.
heights.
(b) Numeral values on fixed circular
(a) Fonts for engraving:
scales shall increase in a clock-
wise direction. On a linear scale
(1) Gorton extended
(2) Groton normal
display, numeral values shall in-
(3) Gorton condensed
crease from left to right on hori-
(b) Fonts for printing and other repro-
zontal scales, and from bottom to
duction methods:
top on vertical scales.
(1) Airport semibold
(c) On those displays which require
(2) Futura demibold
positive and negative indications
(3) Vogue medium
about a zero point, positive values
(4) Lining Gothic No. 66
shall increase in a clockwise or
(5) Alternate Gothic No. 3
upward direction and negative
values shall increase in a counter-
3.1.2.1.1 Letter spacing. There shall be
clockwise or downward direction,
approximately one stroke width space be-
unless otherwise approved by the
tween letters within words, and one standard
procuring activity.
letter width (see 3.2.2) between words in
(d) Instruments and indicators present-
groups. Because letters vary in the amount
ing information to the viewer as
of stroke occupying the left and right edge
to the current status of an im-
of the letter-block space, spacing that is
portant control or equipment
actually unequal between the letter blocks
shall be clearly identified by bear-
can appear more uniform than equal spacing.
ing the nomenclature which indi-
The lettering within words, except for over-
cates the function being measured
all panel identification, shall be arranged to
rather than a specific instrument
read horizontally from the viewer's left to
title. For example, the altimeter
right. Legend or contraction shall normally
should be labeled "ALTITUDE"
be arranged to read horizontally, unless for
and the tachometer should be
clarity of indication or for reasons of space
labeled "RPM". All identification
limitation, a vertical arrangement is neces-
markings placed on instruments
sary. Vertically arranged letters shall be of
and indicators shall be subject to
equal width to provide a pleasing effect.
the approval of the procuring
3.1.2.2 Numeral design. The recommended
activity.
number series is shown on figure 2. This font
is currently available for paste-up layout
3.1.1.1 Letter and numeral design. Letters
2
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