Page:Results of meteorological observations, 1894.djvu/15

 The barometer daily attains its highest point at about 10 A. M., and its lowest at about 4 P. M. Smaller fluctua- tions are also observed during the night. A second maximum occurs at about 10 P.M., and a second minimum at about 4 A.M.

The mean pressures are reduced to sea-level in Table VIII, by means of Table II given in Mr. H. F. Blanford's " Meteorological Tables."

The average monthly values of meteorological elements, &c., are exhibited in Tables I to XXXIII and the 12 monthly reports (pages 7 to 42) contain remarks on the progress of agricultural operations, and the state of crops, as well as notes on the atmospheric phenomena observed during the month, and general remarks on the pressure of the atmosphere, temperature, rainfall and the direction of the wind.

Explanation of the Plates. Plate I shows the normal pressure curve which is high- est in January or December, and then gradually falls till June or July, and afterwards gradually rises again till December or January (see Table III). The highest pressure in 1894 was 30'183", and the lowest 29'385", as will he seen from the yearly abstract, given at page 58. *

Plate II exhibits the normal temperature curve deduced from observations of 25 years. The thick line is drawn to represent the monthly means ; while the means of ten- day periods (tabulated at the foot of Table XIII) are shown by the broken line curve. The highest tempera- ture in 1894 was 95'5 and the lowest 64'4.

The depression of the wet bulb below the dry bulb thermometer is shown by the curve in the second part of Plate II, and has been obtained by a comparison of the dry bulb readings with those of the wet bulb.

Plate IV shows the normal increase and decrease of humidity from month to month and at the same time the comparison of the J894 data with the normal. Humidity in ]894, was nearly the same as in the years 1872, 1886, Ib90 and 1893 and was above the average in the months of January, February, March, April, June, September, October, November and December.

Plate V gives the curves representing (1) the normal cloud proportion for the last 25 years, shown by the thick