MIL-M-18012B
be less than the brightness of the nomencla-
marking of center positions shall be on the
ture on the panel.
left of the switch.
3.1.9.1 Nomenclature. Where nomencla-
3.1.5 Linear switches. The markings asso-
ture is included on the control handle or
ciated with a linear switch shall be placed to
lever or as a part of the background, the
remain visible during hand operation of the
nomenclature shall be insignia white cm a
switch.
black background. The background shall ex-
3.1.6 Thumb wheels. The identification of
tend beyond the nomenclature at least one
thumb wheel-type controls that are perpen-
stroke width of the nomenclature markings
dicular to the control panel and have a part
and be in the form of a rectangle. Where the
of the wheel extending above the panel shall
background is a part of a plastic lighting
be visible while the control is being operated.
plate conforming to MIL-P-7788, the black
and white requirements shall be those of
3.1.7 Pushbuttons (non-transilluminated).
311 MIL-P-7788.
The pushbutton shall be illuminated by
means of a chamfer on the rear of the panel
3.2 Detail.
mounting hole through which the pushbutton
3.2.1 Instrumental indicators.
protrudes.
(a) Numerals and letters: Numeral and
3.1.7.1 Pushbuttons (transilluminated).
letter size specified herein are
The top surface of transilluminated push-
given for a 28-inch viewing dis-
buttons shall be marked with appropriate
tance. For other viewing dis-
legends.
tances (x), the given value
3.1.8 Switch guards. Switch guards in
should be multiplied by x/28.
general do not require special markings be-
Generally all numerals and letters
cause of their installation. Markings for the
shall be within the range specified
switch shall be outside the area covered by
and shall present a visually pleas-
the switch guard.
ing and uncluttered instrument
(display to the operator,
3.1.9 Immediate action controls. All
(1) Height: The height of critical
switches, buttons, and small bandies or levers
shall have a striped panel background,
letters and numerals shall be
between 0.15 and 0.30 inch, ex-
whereas large handles or levers shall be
cept those critical markings
striped on the handle or lever. The striped
whose position is variable shall
colors shall be alternate orange-yellow and
be no less than 0.20 inch.
black. The black stripes shall have a width
(2) Width: The width of the letters
between 1/16 and 1/4 inch and the orange-
and numerals shall be 3/5 of the
yellow stripes shall be three times the width
height, except the numeral "4"
of the black stripe. The stripes shall be ap-
which shall be one stroke width
plied at a 45 degree angle from the vertical,
wider; the numeral "1" and the
rotated clockwise. The striping shall begin
letter "I" which shall be one
and end with an orange-yellow stripe. Back-
stroke width, and the letters
ground striping around a switch or button
"M" and "W" which shall be 20
shall be not wider than 3/4 inch nor less than
percent wider than the other
1/8 inch. If one side of a switch or button haS
letters.
less than 1/8 inch space, no striping shall be
(3) Stroke width: The stroke width
applied to that side. Background Striping
shall be from 1/8 to 1/6 of the
around a small handle or lever shall be no
letter or numeral height. How-
wider than 1 1/2 inches nor less than 1/4 inch.
ever, the width shall be the
Lighted pushbuttons require a lighted back-
same for all letters and numer-
ground with opaque nomenclature. The bright-
als of equal height.
ness of the illuminated pushbutton area shall
6
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