I. The diurnal variations of the wind and barometric pressure at Bombay

Abstract

The object of this paper is to draw attention to a remarkable relation which has been found to exist between the diurnal variation of the wind and the double diurnal oscillation of the barometer at Bombay, and which, it is believed, will be of great interest to all meteorologists. The observations made use of in the discussion are the hourly tabulations from the record of a Robinson’s Anemograph from June 1867 to May 1870, the hourly observations of the barometer and temperature of the air for the same period, and the corresponding pressure of vapour (calculated from the readings of the dry- and wet-bulb thermometers), and also some particular results of later date which will be introduced in the course of the inquiry. A full description of the various instruments and the methods of observation and reduction is given in the introduction to the “Bombay Magnetical and Meteorological Observations, 1865—70;" but it may be well briefly to recapitulate here the method of reducing the anemograph indications, as it is entirely owing to its mathematical exactness that the results now brought forward have been obtained, and it is therefore deserving of special attention.