Thunderstorm

Code VIII. — Tleii/ht of Barometer.

The reading of the mercury barometer is to be corrected for index error, and reduced to 0° C. and sea level. A table of corrections is given below.

The corrected reading is coded by omitting the first figure of the barometer reading in tenths of a millimetre : for example, 761"2 mm. is coded as 612.-

A table for converting hundredths of an inch to tenths of a millimetre is given below.

Code IX.

Air Temperature is coded in two figures according to the following table : —

Degrees

Code No.

Degrees

Code No.

Centigrade.

Fahrenheit.

Centigrade.

Fahrenheit.

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