MIL-M-18012B
work, in double the specified sizes, as Artype
letters and numerals will be measured from
S-274. Numeral designs shown in MS33558
centerline to centerline of the stroke. All
are acceptable for parts covered by this
letters and numerals shall be proportioned
to provide a pleasing visual effect. When one
specification. The following commercial fonts
letter or numeral is selected at the lower
having the size ratios specified herein for the
tolerances, the remaining letters or numerals
classes and types of control panels covered by
of the control panel shall also be selected at
this specification may be used. Stroke width
the lower tolerance.
of engraved letters shall be the same as that
of the acceptable type fonts of the same
3.1.2.7 Display-control relationship. Con-
letter height.
trols associated with a display should be
proximal to the display in an arrangement
(a) For-its for engraving:
whereby the display unit will be visible dur-
(1) Gorton extended
ing operation of the control. The control and
(2) Gorten moderne
display shall be linked in a manner specified
(b) Fonts for printing and other repro -
in MIL-STD-203 and MIL-STD-250.
duction methods:
(1) Futura medium
3.1.2.7.3 Control knob identification. Iden-
(2) Futura tempo bold
tification markings of control knobs shall be
placed on the adjacent panel area, not on the
3.1.2.2.1 Numeral spacing. There shall be
knob itself, except as otherwise specified
approximately one stroke width space be-
herein and in MIL-STD-411.
tween digits forming a single numerical in-
3.1.2.8 Control panel identification. Words
dication.
and letters used for identification of an en-
3.1.2.3 Punctuation and symbols. PUnctua-
tire panel or the portion of the panel includ-
tion marks shall not be used. Specialized
ing several controls making up a functional
symbols, such as arrows, plus or minus signs.
group shall be larger than the other letter
and degree markings, shall be used only when
heights used. The panel-identifying legend
essential to the meaning of the legend. When
shall be located at the top of the panel and
used, symbols shall not exceed the adjacent
shall be standard horizontal lettering. Mark-
lettering in stroke width.
ings irrelevant to the operator, such as stock
numbers and aeronautical type designations,
3.1.2.1 Legends and contractions. Gencr-
shall be avoided.
ally, ease of interpretation must be provided
without an excessive number of control panel
3.1.3 Counter displays. The number of
markings. Contractions shall be substituted
digits that can be displayed on the counter
for complete words when space limitations
shall be obvious to the operator at all times.
prohibit the use of the entire word. No fixed
regardless of the momentary reading on the
maximum can be placed on the number of
display.
letters in a legend for it to be spelled out.
3.1.4 Toggle switches. Except where
Contractions shall be subject to the approval
readability is compromised, the identification
of the procuring activity.
of the switch shall be placed above the
3.1.2.5 Lines. Marginal lines around
switch. Where readability is compromised,
grouped control markings and underlinings
the identifcation shall be placed adjacent to
shall not be used.
arid easily identifiable with the switch. Switch
positions shall be marked in the direction of
3.1.2.6 Marking sizes. All letter and nu-
travel. For center positions, the markings
meral measurements shall be made from the
shall be placed on the right of the switch for
outside edges of the stroke lines for other
left-hand operation and on the left of the
than machine engraving on opaque surfaces.
switch for right-hand operation. When the
For all mechanical engraving on opaque sur-
location of the equipment is indefinite, the
faces, the dimension controlling the size of
4
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