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TM 9-6685-202-14
CHAPTER 3
OPERATING INSTRUCTIONS
Section I. SERVICE UPON RECEIPT OF MATERIEL
3-1. Unpacking
responsibility of the officer in charge to determine
whether the materiel has been properly prepared for
The barometer is received in a wooden box with
service and if it is in condition to perform its assigned
approximate dimensions of 22 by 24 by 70 inches. In
mission when placed in service. Inspect all major units,
order to protect the instrument during shipment, the
assemblies,  subassemblies, and equipment to make
vacuum in the mercury tube is released and the mercury
sure that they are properly assembled, secure, clean,
locked in the cistern. The barometer is also removed
and correctly adjusted.
from the mounting platform. Unpack the barometer as
(1) Check  all  spare  parts,  tools,  and
follows:
equipment to be sure every item is present, in good
condition, clean, and properly mounted and stored.
a. With the box placed horizontally, remove the
(2) Make a record of any missing parts and
top.
malfunctions.  Correct any deficiencies as quickly as
possible.
b. Remove coils of cellulose wadding.
(3) Special attention must be directed to the
c. Lift out the inner box and mounting platform.
small parts as they are more likely to become lost. This
d. Remove the 16 by 16-inch plywood squares at
may seriously affect the proper functioning of the
either end of the inner box.
materiel.
e. Withdraw screws securing lid and open inner
(4) Whenever practicable, the operator will
box.
assist in the performance of these services.
f. Withdraw nails securing upper half of yoke,
which retains barometer.
b. Precision Instrumentation.  Determine that the
delicate elements of the barometer have been unpacked
g. Remove the two socket head screws securing
without damage or distortion.
base of barometer to end of box.
CAUTION
(1) All switches and controls must function
normally.
Do not grasp the instrument by
either the scale bar, the vernier slide
(2) All vernier scales and other essential
assembly or the cam bar (see figure
markings shall be legible.
1-2).  Bending the cam bar a few
(3) The scale, scale rod, thermometer rod,
thousandths of an inch is discernible
and cam bar must not be bent or distorted. These items
as an error in instrument readings.
are straightened to within 0.001 inch and should be so
maintained to retain maximum accuracy.
h. Open
moistureproof
bags
and
remove
desiccant.
3-3. Reporting Discrepancies
i. Remove wax wrapping from the barometer.
a. Refer to paragraph 1-5 and appendix A for
j. Unwrap the mounting platform.
applicable forms, records and reports for inspection. An
k. The barometer is not installed on the mounting
examination of the preventive maintenance records of
platform until after it has been physically inspected and
the barometer will reveal its general maintenance
the mercury tube has been pumped free of moisture.
background.  A record of progressive repairs may
indicate that the unit is in excellent condition. All cloth
3-2. Inspection
or paper tags attached to the materiel should be
carefully noted and indicated. Verify the serial number
a. Mechanical  Parts.
When  a
new
or
of the materiel with the numbers recorded in the records
reconditioned barometer is received, it is the
of the using personnel.
3-1

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