Email: Survey Officer


Evans, John Silas [Canon (1864-1953), amateur astronomer and
author, served as a curate in Dyserth and Vicar of Cyffylliog (Jones 2014, 79-80).

Jenkins, Griffith Parry (1860-1940), amateur observer, popular lecturer, one time resident in Colwyn Bay (Jones 2014, 78).

Mills, Caradoc (1883-1950) amateur astronomer, popular author, Llanrwst (Jones 2014, 80).

Owen, Derek (?-1989), Pensarn, amateur observer .

Owen, Gwilym [Prof.] (1880-1940), professor of physics at Aberystwyth, born in Denbigh (Jones 2014, 82).

Roberts, Isaac  [Dr.] (1829-1904), pioneer of astrophotography was born at Y Groes, near Denbigh (Jones 2014, 76; see Lancashire).

Astronomy Groups

Clwyd Astronomical Society (ClAS), existed (1976-c.1979).

North Clwyd Astronomical Society (NCAS), existed (1981-1989).

Authors, lecturers, broadcasters

Gwilym Owen, Prof. (1880-1940), professor of physics at Aberystwyth and author of popular books on astronomy and physics, born in Denbigh.

Academics and associated professionals

Gwilym Owen, Prof. (1880-1940), professor of physics at Aberystwyth, born in Denbigh.


Telescope/equipment manufacturers

Useful addresses

Local History Centre
46 Clwyd Street, Ruthin, LL15 1HP, Wales (Tel 01824 708250; Fax 01824 708258; Email

County Record Office: The Archive and Modern Record Service

The Old Board School, Lloyd Street, Llandudno, LL30 2YG (Enquiries: Telephone or fax the service on (01492) 860882; email:

1 Response to Denbighshire

  1. Bill Barton says:

    The chronometer maker Edward John Dent, FRAS, Associate ICE, (1790-1853) worked for some time in the mid-nineteenth century to simplify the transit telescope originally developed by Ole Rømer (1644-1710) in Denmark. Dent was motivated to make it easy for the non-astronomer to ascertaining the correct time easily. He was approached by James Mackenzie Bloxam, a barrister from Denbighshire (born circa 1814, died 1857), with an already working device. The two went into partnership with the first dipleidoscopes going on sale for two guineas (£2 2s or £2.10, equivalent to £161 at 2010 prices when adjusted for inflation) in March 1843. Bloxam appears to have been afraid of compromising his professional standing as a barrister with much of his work being published only after he died. To secure their respective rights over the device, a patent was sought by Bloxam and was granted on 20 June that year (United Kingdom Patent no. 9793). A French patent was applied for on 24 July 1844. After Dent died his stepson Frederick William Dent took over manufacture.

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