F 6
Monthly Weather Maps.-Weather maps showing the mean monthly atmospheric pressure and wind direction and force over the China Sea were published at the end of the year and distributed to the principal observatories in different parts of the world. A small supply is available for shipmasters, who may obtain them free of charge on application to the Director. A small supply is also available for the public at $3 each. These maps, which were drawn by Messrs. Jeffries and Evans and lithographed at the Observatory, were constructed from data collected during the years 1890-1912 and reduced by the Observatory Staff.
The effect of the islands of Formosa, Luzon and Hainan on the pressure distribution is very marked. A V-shaped depression is shown over the S.W. coast of Formosa and a wedge over the N.E. coast, except in the summer months, when the gradients over the island are relatively shallow and the trend of the isobars uncertain. In June and July the conditions are reversed, the wedge appearing over the S.W. coast and the V over the N.E. coast. In August and September there appears to be a low over the N.E. coast.
A very remarkable V-shaped depression is shown over the west coast of Luzon in the winter months, but in the summer months the trend of the isobars is uncertain, particularly in August. As regards the effect of the Island of Hainan, in the winter months there is a tendency for the isobars to encircle the island, but a large number of accurate observations are required to trace the effect in the summer months. The trend of the isobars farther south than latitude 16° N. is uncertain in every month, but the absolute values are sufficiently accurate for the sailor.
Monthly Seismological Bulletin.-The publication of a monthly seismological bulletin, giving particulars of earthquakes recorded by the Milne-Shaw seismograph, was continued throughout the year, and distributed to the principal seismological Observatories.
Miscellaneous Returns.-A monthly abstract of observations made at the Observatory is published in the Government Gazette, and monthly and yearly results are published in the Blue Book in the form suggested by the London Meteorological Office for the British Colonies. The monthly departures from normal of the barometric pressure at four China-Coast Ports are communicated to the Commonwealth Meteorologist, Melbourne, in connection with long range weather forecasts. Monthly Meteorological returns are forwarded to the Meteorological Magazine, and annual returns to the Stock Exchange Official Intelligence, the Colonial Office List and Whitaker's Almanack. Particulars of the calendar, eclipses, times of sunrise and sunset &c. are communicated to the “Directory and Chronicle" and the "Hongkong Dollar Directory".
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F 6
Monthly Weather Maps.-Weather maps showing the mean monthly atmospheric pressure and wind direction and force over the China Sea were published at the end of the year and distributed to the principal observatories in different parts of the world. A small supply is available for shipmasters, who may obtain them free of charge on application to the Director. A small supply is also available for the public at $3 each. These maps, which were drawn by Messrs. Jeffries and Evans and lithographed at the Observatory, were constructed from data collected during the years 1890-1912 and reduced by the Observatory Staff.
The effect of the islands of Formosa, Luzon and Hainan on the pressure distribution is very marked. A V-shaped depression is shown over the S.W. coast of Formosa and a wedge over the N.E. coast, except in the summer months, when the gradients over the island are relatively shallow and the trend of the isobars uncertain. In June and July the conditions are reversed, the wedge appearing over the S. W. coast and the V over the N.E. coast. In August and September there appears to be a low over the N.E. coast.
A very remarkable V-shaped depression is shown over the west coast of Luzon in the winter months, but in the summer months the trend of the isobars is uncertain, particularly in August. As regards the effect of the Island of Hainan, in the winter months there is a tendency for the isobars to encircle the island, but a large number of accurate observations are required to trace the effect in the summer months. The trend of the isobars farther south than latitude 16° N. is uncertain in every month, but the absolute values are sufficiently accurate for the sailor.
Monthly Seismological Bulletin.-The publication of a monthly seismological bulletin, giving particulars of earthquakes recorded by the Milne-Shaw seismograph, was continued through- out the year, and distributed to the principal seismological Observatories.
Miscellaneous Returns.-A monthly abstract of observations made at the Observatory is published in the Government Gazette, and monthly and yearly results are published in the Blue Book in the form suggested by the London Meteorological Office for the British Colonies. The monthly departures from normal of the barometric pressure at four China-Coast Ports are communicated to the Commonwealth Meteorologist, Melbourne, in connection with long range weather forecasts. Monthly Meteorological returns are forwarded to the Meteorological Magazine, and annual re- turns to the Stock Exchange Official Intelligence, the Colonial Office List and Whitaker's Alınanack. Particulars of the calendar, eclipses, times of sunrise and sunset &c. are municated to the “Directory and Chronicle" and the "Hongkong Dollar Directory".
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