MIL-DTL-6508C
3.6.6 Pointer. The pointer shall be as light as practicable, and sufficiently rigid to
prevent oscillation under vibration in excess of the requirements specified herein. Pointer stops
shall not be used. The pointer shall conform to figure 1. The length of the pointer shall be
sufficient to provide 1/3 to 2/3 overlap of the 2-degree graduations.
3.6.7 Dial. The dial shall conform to figure 1, and shall be securely fastened to the case
or frame of the mechanism in such a manner that it will not loosen or turn when the thermometer
is vibrated. The scale arc of the dial shall be not less than 310 degrees.
3.6.7.1 Dial markings. Dial markings shall be durable and in accordance with figure 1.
The style and proportions of the letters and numerals placed on the dial shall conform to
MS33558. The dimensions of dial markings and the type of paint used shall be as shown in
figure 1. The lusterless white shall be in accordance with FED-STD-595/37875. The lusterless
black shall be in accordance with FED-STD-595/37038.
3.6.7.2 Numerals. Numerals shall distinctly indicate the graduation to which each
applies. If practicable, each numeral shall be placed so that the center of mass of the numeral is
on the radial line joining the appropriate graduations and the center of the dial. Any confusion
resulting in doubt as to which graduation the numeral applies shall be cause for rejection. When
several numerals are used in one group, the space between the numerals shall not be less than
0.016 inch.
3.6.8 Cover glass. The cover glass shall be clear and free from flaws.
3.6.9 Dial to cover glass distance. The distance between the dial and cover glass shall be
0.125 +0.025/-0.015 inch, when measured at the graduations on the dial.
3.6.10 Parallax. To avoid parallax, the pointer shall be reasonably close to the dial
without interfering with the action of the thermometer. The distance between the dial and
pointer shall be not greater than 0.10 inch.
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