Drew's first celestial observations were made with a three and a half foot
refractor. In 1847, he installed a five-foot
achromatic telescope by
Dollond, mounted equatorially, in a small
observatory he built for the purpose in his garden. With the help of a
transit circle by Jones and of the Beaufoy clock, lent by the
Royal Astronomical Society, he very accurately determined the time, and supplied it during many years to the ships leaving Southampton. He published a number of papers on astronomy, geology, and
meteorology. At the Southampton meeting of the
British Association in 1846, Drew was appointed one of the secretaries of the mathematical section, and printed for the use of the association a pamphlet
‘On the Objects worthy of Attention in an Excursion round the Isle of Wight, including an Account of the Geological Formations as exhibited in the Sections along the Coast’. On 9 January 1846, he was elected a member of the Royal Astronomical Society. Between 1848 and 1853, he took systematic meteorological observations, and summarised the results in two papers on the
‘Climate of Southampton’, read before the
British Association in 1851 and 1854 respectively. Invited to assist in the foundation of the
Meteorological Society in 1850, he wrote a series of papers
‘On the Instruments used in Meteorology, and on the Deductions from the Observations’ which were extensively circulated among the members of the society, and formed the groundwork of a treatise on
‘Practical Meteorology’, published by Drew in 1855, and re-edited by his son in 1860. His last work was a set of astronomical diagrams, published by the Department of Science and Art in 1857, representing the moon, planets, starclusters, nebulæ, and other celestial objects. ==Death==