The History of Hut Eight

Ausgabe 2.	Letter	Table
	1	1	Latitude in degrees.
	2	2	Longitude in degrees.
	3	3	General area and direction of pressure change.
(Tables 1 and 2 give ambiguous answers which are distinguished by the general area given in 3).
	4	4	Air pressure to nearest 2 millibars.
	5	5	Air temperature in degrees Centigrade
	6	8	Wind direction and strength.
	7	6	Present weather and clouds.
	8	7	Visibility.
	9	9	Direction and type of swell.
	10, 11		Signature.
Ausgabe 3.
	1	1	General area, direction of pressure change.
	2, 3	2	Position (from map issued).
	4	3	Air pressure to nearest 2 millibars.
	5	4	Present weather and clouds.
	6	5	Weather changes in last 2 hours.
	7	6	Visibility of fog.
	8	7	Wind direction and veer.
	9	8	Wind strength and gustiness.
	10	9	Change in wind strength, height of swell.
	11	10	Length and direction of swell.
	12	11	Air temperature in degrees Centigrade.
	13	12	Temperature difference between air and water.
		13	Ice conditions.
	14, 15 or (16).		Signature.

The tables are constructed alphabetically,

e.g. -13 degrees Centigrade = M.
+14 degrees Centigrade = N etc.

and many of them are 2 dimensional tables, table 9 of the 2nd edition being typical;

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