Applied Correction Scale and Index (Type A-1 Only)

TM 9-6685-202-14

ing ring slide. These two arms at a 90 degree angle

2-6. Applied Correction Scale and Index (Type A-1

convert the horizontal displacement of the cam bar,

Only)

which is proportional to the temperature and gravity

errors at the point where the vernier slide is positioned,

A vernier strip is fastened to the sighting ring

to a vertical displacement of the sighting ring slide. As

slide, which, when read against the applied correction

explained in paragraph 2-3, moving the sighting ring

scale on the vernier slide, indicates the direction and

with respect to the scale index will effectively increase

magnitude of the correction being applied. Its indication

or decrease the height of the mercury column as read

is used only in calibrating or checking the computing-

on the scale. Thus the barometer reading is corrected

correcting mechanism, and may be disregarded in the

for temperature and gravity errors and the scale reading

normal use of the barometer.

is the true pressure as reduced to standard conditions.

2-3