IX. On the lunar atmospheric tide at Singapore

Abstract

At the commencement of the year 1847, a paper by Colonel Sabine, R. A., V. P. R. S., was read before the Royal Society on the Lunar Atmospheric Tide at St. Helena. The influence of the moon upon the barometer, although small in amount, was shown in a very striking and decided manner; for after eliminating the regular diurnal variation, the differences arranged in lunar tables showed a decided maximum, both at the superior and inferior culmination of the moon, and a decided minimum at its rising and setting. The effect which the moon’s position, relatively to the meridian of the place, had upon the barometric pressure, was publicly noticed, about the middle of 1842, by Captain Lefroy, R. A., who appears to have had his attention directed to it from the first establishment of the observatory at St. Helena.