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Page Title: Figure 3-4. Sighting the mercury level.
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TM 9-6685-202-14
C1
(2) Lock vernier clamp nut and make the final
NOTE
adjustment with the vernier adjusting knob (fig. 1-2).
Rapping  the  table  before  each
(3) When sighting the meniscus, use the
reading will aid in adjusting the
barometers light to provide an illuminated background.
meniscus shape in the tube and
cistern.
The  error  incurred  by
(4) Move the eye up and down to be sure it is
improper meniscus shape may be as
aligned with both the front and rear edges of the sighting
ring. Correct alignment is achieved at the point where
large as 0.15 mm.
the greatest amount of light is visible behind the
meniscus. At the correct position of sighting ring and
(1) Unlock the vernier clamp nut and adjust
eye, the two edges of the sighting ring and meniscus will
the vernier slide assembly so that the lower edge of the
appear to just touch as in figure 3-4.
sighting ring is approximately in line with the top of the
mercury column.
Figure 3-4. Sighting the mercury level.
lists constant values of units of measurement used in
manufacturing  and  utilizing  mercury  barometers.
c. Constant Value of Units
Table 3-1. Constants Used in Construction and Calibration of Mercurial Barometers.
DATA
VALUE
1 mm of mercury
0.019337 psi
10-1 cm - 10-3 m
1 mm
1 mm
0.039370079 in.
1 in.
25.4 mm . 2.54 cm
3
2
1 mb
10 dynes cm-
1 mm
1 torr
1 micron
1 millitorr
3-9

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