MIL-DTL-17896E
(Application for copies should be addressed to the American National Standards Institute
25 West 43rd Street, 4th floor New York, NY 10036. Electronic copies of ANSI standards may
be obtained from https://www.ansi.org/.)
ASTM INTERNATIONAL
ASTM B 108
- Standard Specification for Aluminum-Alloy Permanent Mold
Castings.
ASTM D 788
- Standard Classification System for Poly (Methyl Methacrylate)
(PMMA) Molding and Extrusion Compounds.
(Application for copies should be addressed to ASTM International, 100 Barr Harbor Drive,
West Conshohocken, PA 19428-2959. Electronic copies of ASTM standards may be obtained
from https://www.astm.org/.)
2.4 Order of precedence. In the event of a conflict between the text of this document and the
references cited herein, the text of this document takes precedence. Nothing in this document,
however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.3.
3.2 Material.
3.2.1 Corrosion resistance. Metal parts used in the construction of the barometer shall be
resistant to corrosion due to electrolytic decomposition, fungus, salt fog, and any other atmospheric
condition that may be encountered during use or storage. Aluminum alloy parts shall be anodized or
alodined.
3.2.2 Mercury free. All materials used in the barometer or any supplied components shall
be mercury free in accordance with drawing 13873-03-0001. A certificate of compliance shall be
included with each barometer.
3.3 Design and construction. The barometer shall consist of a case, window, dial, set and
index hands, and an aneroid mechanism with the option of a bezel ring and reflector or spacer ring.
The barometer shall be constructed so that no parts will work loose due to strains, jars, vibrations,
shock, and other conditions incident to shipment, storage, installation, and service. All screws, nuts,
and threaded parts shall conform to FED-STD-H28, except where a definite need for a special
thread can be demonstrated to exist. Fasteners shall be adequately secured with lock washers,
elastic stop nuts, or similar devices to prevent loosening when subjected to vibrations. No special
tools shall be required to adjust the barometer.
3.4 Case. The case shall be made of a commercial spun, drawn, or cast brass or bronze, or
shall be an aluminum-alloy die casting in accordance with ASTM B 108 alloy number 356.0, B443.0,
or 713.0. The case shall be circular in shape and shall have an inside depth of not less than two inches
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