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 TM 9-6685-202-14
and a pushbutton switch for the light are also included.
(4) Barometer Tube Assembly.
The
barometer tube assembly consists of a glass barometer
tube (fig. 1-2) with a gasket for sealing it to the base.
(2) Cistern and Base Assembly.
The
The glass tube is the container for the mercury column
mounting platform (fig. 1-2) consists of a stainless steel
and is made of precision bore pyrex tubing. The lower
base on which is mounted the cistern, the barometer
end connects to the cistern by means of the connecting
base, the barometer tube, and the gage block mount.
passage in the barometer base.
The cistern is a precision bore pyrex cylinder. The
(5) Vacuum Gage Assembly. The vacuum
barometer base incorporates a connecting passage
between the cistern and the barometer tube. The
gage assembly consists of an electrical meter, driven by
cistern is pressure sealed with gaskets to the base on
a thermoconductivity type sensor element. The sensor
the lower end and to a cistern lid at the upper end. The
element is connected to the evacuation manifold and
lid incorporates a cistern nipple and gasket for
monitors the vacuum above the mercury column
connecting the barometer to a pneumatic system under
continuously.
test, and a micrometer for measuring the mercury level
in the cistern. The barometer base is fastened to the
1-8. Tabulated Data
mounting platform by two hexagon socket head screws
which thread into tapped holes in the platform assembly.
dimensions, weight, and performance capabilities and
(3) Barometer Frame Assembly. The frame
limitations of the type A-1 barometer and the metric
assembly is composed of two 7/8 inch diameter rods
mercurial barometer type A-1 (modified).
mounted vertically on the barometer base, (fig. 1-2) on
either side of the barometer tube. The upper end of
each rod is fastened to a top mounting disc x rich also
the data on dimensions and performance characteristics
provides support for the upper end of the barometer
of the rotary vacuum pumps and constant vacuum
tube. The lefthand rod, known as the scale rod, carries
regulator used with the barometers as auxiliary
the scale and vernier slide assembly. The right-hand
equipment.
rod, known as the thermometer rod, carries a
thermometer to indicate the existing temperature. The
thermometer is graduated from 0to 40C.
Table 1-1. Barometer Data
Type A-1 (Unmodified)
DATA
VALUE
Physical Data
Cubic contents crated
without spares.
21.3 cu feet
Weight without equipment spares
Weight, empty
34 lbs
Weight with mercury
40.5 lbs
Weight of mercury
6.5 lbs
Overall dimensions
Height
42.5 inches
Width of base
10.5 inches x 10.5
inches
Crated dimensions
22 x 24 x 70 inches
1
See footnote at end of table.
1-8
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