MIL-DTL-27190C
3.3.4.1 Dial markings. The dimensions and colors of the dial markings shall be in
accordance with table I. Colors shall conform to FED-STD-595.
TABLE I. Dial marking dimensions and colors.
Height or length
Width of line or graduation
Color
in inches ±1/64 inch
in inches ±0.005 inch
number
Numerals 0, 1, 2, 3, 4
3/32
0.0213
37875
Graduations at 0, 1,000,
7/64
0.030
37875
3,000, 4,000
Graduation at 2,000
3/32
0.030
37875
500-psi graduations
1/16
0.015
37875
Lettering "HYD"
5/64
0.015
37875
Lettering "X1000"
5/64
0.010
37875
Background of dial
--
--
37038
3.3.4.2 Finish of markings not specified. The finish of markings not otherwise specified
shall be in accordance with FED-STD-595, color number 37038.
3.3.4.3 Dial visibility. Portions of the minor graduations on the dial shall be visible
when viewed from any position within the frustum of a cone, the side of which intersects the
outer edge of the cover glass and makes an angle of 30 degrees with the perpendicular through
the center of the dial.
3.3.4.4 Dial-to-cover glass distance. The distance between the indicator dial and the
inside of the cover glass shall be the minimum practicable and shall not exceed 0.188 inch.
3.3.5 Filler tube. A tube or other facility for evacuating and filling the case shall be
provided at the rear of the case and shall be recessed beneath the level of the back plate surface.
If a tube is used, it shall be of such length as to permit three refillings of the case.
3.3.6 Cover glass. The cover glass shall be clear, flat, and free from flaws that would
interfere with the normal reading of the instrument. The thickness of the cover glass shall be the
minimum practicable and suitable for the purpose.
3.3.7 Fasteners. The dial shall be securely fastened to the frame of the mechanism in
such a manner that it will not loosen or turn when the indicator is vibrated. If screws are used
for attaching the dial, they shall be located so that they will not interfere with dial markings or
prevent the markings from being located in the proper position.
3.3.8 Electrical zero reference mark. The dial shall be provided with an electrical zero
reference mark on the scale portion equidistant in angular degrees between the first and last dial
graduations.
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