Height of barometer and air temperature

.5. Barometric tendency and sea-surface temperature.

The time to be adopted :

In all radiotelegrams relating to ice or derelicts the time shall be given in Greenwich mean time.

TTie Address :

Reports, when sent to the Hydrographie Office, Washington, should be addressed "Hydrographie"; reports to the Meteorological Office, Londoji, should be addressed •' Meteorology."

The Message :

1. When sending information about ice or derelicts alone, two groups of five figui-es each are used, preceded by the word " ice " ; these groups may be repeated as often as necessary.

2. If meteorological information is to be sent in addition, a further four grou^js of five figures each are used, preceded by the word " weather." These groups are inserted at the end of the message after all the information relating to ice has been given.

N.B. — If the message contains the word " weather," all the code groups before that word gi^'e information relating to ice, and those after the word " weather " give meteorological information. If there is no word " weather " in the message, it only contains information about ice. (See examples of the two kinds of message given in this Article.)