Observatories: Essex

Bradley’s Observatory [BrO], Wanstead (1727-47), established by Revd. James Bradley at the rectory of James Pound – site of Wanstead High School.  It was equipped with a 12 1/2-foot Zenith Sector (1727) by Geo. Graham, London.  The instrument had the advantage of a large field of view and he was able to obtain precise positions of a large number of stars that transited close to the zenith over the course of about two years. This established the existence of the phenomenon of aberration of light, and also allowed Bradley to formulate a set of rules that would allow the calculation of the effect on any given star at a specified date. Later the instrument was moved to the Royal Observatory, Greenwich after Bradley became Astronomer Royal (Howse 1986, 82).

Felsted School Observatory (circa 1930/50s)

Pound’s Observatory [PO] Wanstead, (c.1717-47), established by the Revd. James Pound at Wanstead Park near his home at Wanstead.  Equipped with an ‘aerial telescope’ by Huygens (7.5-inch OG, fl-123feet), on loan from the Royal Society. Here he observed the five known satellites of Saturn, used by E. Halley to correct their movements. Pound trained his sister’s son, James Bradley and many of their observations were made together, including the opposition of Mars in 1719, and the transit of Mercury on 29 October 1723. Their measurement of γ Virginis in 1718 was the first made of the components of a double star and was directed towards the determination of stellar parallax (Howse 1986, 82).

Mobberley’s Observatory  [MobOGB], Great Baddow, Chelmsford (1991-2008), established by Martin Mobberley.  The main Instrumentis being a 19-inch (0.49m) Newtonian reflector housed in a roll off shed (Moore 1996, 177-86).

Tomkins’s Observatory [ToO], East House, East Lane, Dedham (c.1924-34), established by Herbert Gerald Tomkins (1869-1934) with a 24-inch Cassegrain reflector for lunar photography (Obit., MNRAS, 95, 332-3; also see Orwell Astronomy Society: History section [http://www.oasi.org.uk]).