Page:Results of meteorological observations, 1894.djvu/16

 line, and (2) the amount of cloud for the year 1894, which exceeded the average in April, May, June, July, August, September and October and was largely below it in January, February and December. It will be seen from the nor- mal curve that the sky is most heavily clouded in July and least clouded in January.

Plate VI exhibits the total rainfall for each year for the past 29 years as given in Table XXIV. At the bot- tom of the plate is shown the average rainfall for each month of the year.

Routine work and description of the Meteorological Instruments in use. There has been no change in the staff of observers, and the meteorological observations taken have as usual been supplied to the Meteorological Reporters to the Govern- ments of India and Bengal, the Yizagapatarn District Gazette and the Port Officer of Vizagapatam,

Daily telegrams giving the 8 A.M. observations were forwarded throughout the year to the Meteorological Re- porters to the Governments of India, Bengal and Madras.

The barometric readings are obtained from a self -com- pensating standard barometer by Negretti and Zambra which was tested by Mr. H. P. Blanford, the late Meteoro- logical Reporter to the Government of India, by com- parison with the instruments at Calcutta.

The mean temperature was deduced from the readings of a dry bulb thermometer by Negretti and Zambra up to September 16th, 1894, and from that date forward from the dry bulb hygrometer No. 91690 by Casella. The adopted mean temperature of each month is the mean of the readings of the dry bulb, maximum and minimum thermometers. The maximum and minimum temperatures in shade are obtained from the readings of the maximum and minimum thermometers l)y Negretti and Zambra Nos. 75271 and 63933 respectively, the maximum thermo- meter having been tested by the Alipore Observatory and the minimum thermometer "by the Kew Observatory. The other temperature observations are obtained from Mason's Hygrometer, tested by the Alipore and Kew Observatories, and from other instruments.

The hygrometrical results (except the dew-point and humidity percentage) have been calculated by the Smith-