158
Table IX.
In 2 hours.
In 3 hours.
In 4 hours.
Code Figure.
Barometer steady-Has not risen
or fallen more than
0.3 mb. (.01 in)
0,5 mb. (.01 in)
0.7 mb. (.02 in)
0
Barometer
rising
slowly-Has
0.7-1.0 mb.
risen
(.02-.03 in)
1.0-1.5 mb. (.03-.05 in)
1.3-2.0 mb.
1
(.04-.06 in)
Barometer rising-Has risen
1.4-2.4 mb. (.05-.07 in)
2.0-3.5 mb. (.06-.10 in)
2.8-4.8 mb. (.08-.14 in)
ลง
2
Barometer rising quickly-Has
risen
2.6-4.0 mb. (.08-.12 in)
4.0-6.0 mb. (.12-.18 in)
5.2-8.0 mb.
3
(.15-.24 in)
Barometer rising very rapidly-
Has risen
"
over 4.0 mb. .12 in)
over 6.0 mb. (,,
over 8.0 mb.
4
.18 in)
(.,, .24 in)
Barometer falling slowly-Has
fallen
0.7-1.0 mb. (.02-.03 in)
1.0-1.5 mb. (.03-.05 in)
1.3-2.0 mb.
5
(.04-.06 in)
Barometer falling - Has fallen
1.4-2.4 mb. (.05-.07 in)
2.0-3.5 mb.
2.8-4.8 mb.
6
(.06-.10 in)
(.08-.14 in)
Barometer falling quickly-Has
fallen
2.6-4.0 mb. (.08-.12 in)
4.0-6.0 mb.
5.2-8.0 mb.
7
(.12-.18 in)
(.15-.24 in)
Barometer falling very rapidly over 4.0 mb. over 6.0 mb.
over 8.0 mb.
8
00
Has fallen
(
.12 in) | ( .18 in)
"}
(.
.24 in)
(The change in 3 hours should be given if possible).
Table XII.
Dense fog
Thick fog
Fog
Moderate fog
Mist or haze, or very
poor visibility
Poor visibility
Moderate visibility
Good visibility
Very good visibility
Excellent visibility
Code Figure.
Objects visible at 27 yards.
0
Objects visible at 55 yards
1
Objects visible at 1 cable
2
Objects visible at 2 cables
3
mile (nautical) 1 mile (nautical) 2 miles (nautical)
5
Objects visible at Objects visible at Objects visible at
Objects visible at 5 miles (nautical)
Objects visible at 10 miles (nautical)
Objects visible more than 30 miles (nautical) 9
44
(Further information concerning the code may be found in the 'Marine Observer" for January, 1934, and subsequent issues, obtainable from the Meteorological Office, London).
1st April, 1938.
C. W. JEFFRIES,
Director.