Archive for Thomas Grubb

Another Edgeworth Connection

Posted in History, The Universe and Stuff with tags , , , , , , , , , on November 3, 2024 by telescoper

A week or so ago I posted an item about the Edgeworth family that included a reference to Kenneth Edgeworth, an amateur astronomer of some note who first posited the existence of what is now known as the Kuiper belt. Here’s another interesting connection. Kenneth Edgeworth was born in 1880 in Daramona House in Street in County Westmeath. The owner of this house was Edgeworth’s uncle, another astronomer called William Edward Wilson who built an observatory next to Daramona House.

Here are pictures of (left) house and (right) the observatory, neither of look in particularly good condition!

After independence, many of the large houses owned by the rich Anglo-Irish families who had run Ireland until then fell into disrepair or were destroyed.

Anyway, on top of the two-storey observatory building there used to be a dome that housed a 24″ Grubb reflecting telescope. Here’s an old picture showing what it looked like in better times, around 1900:

The dome is no longer there, and neither is the telescope. The latter was donated to the University of London in 1925 eventually housed in the Observatory at Mill Hill, now run by University College London. Here is an excerpt from the history of the University of London Observatory:

W.E. Wilson established an observatory at Daramona, Street, County Westmeath, in 1871 and equipped it with a 12-inch equatorial reflector by Grubb. Wilson (born in 1851, elected FRS in 1896, an original member of the BAA, awarded an honorary DSc by the University of Dublin in 1901, High Sheriff of Co. Westmeath in 1894), observed the transit of Venus in 1882 and solar eclipses at Oran in 1870 and Spain in 1900, published many papers in Proc. R. Soc, Proc. R. Dublin Soc., Proc. R. Irish Acad., etc., and died in 1908) enlarged his observatory in 1881 and installed a 24-inch reflector by Grubb on the mounting previously used for the 12-inch reflector. Ten years later a new mounting was constructed. It is this mounting which was moved to Mill Hill in 1928. Dr. Wilson used his telescope to make some of the best photographs of his time of star clusters and nebulae, and he worked extensively on problems of solar physics and the solar constant. The telescope may be used in Newtonian and Cassegrain forms; the focal length of the mirror is 10 feet and the equivalent focal length at the Cassegrain focus is approximately 42 feet. The telescope was moved in 1928 from Ireland to University College, where minor modifications were made to the focussing arrangements and plate-holder, and an electric motor was added to rewind the driving clock automatically.

The Wilson telescope was retired from active service in 1974 and moved to the World Museum in Liverpool where, as far as I know, it remains on display to this day.

Grubb Parsons: the Irish Connection

Posted in History, The Universe and Stuff with tags , , , , , , , , on April 15, 2019 by telescoper

The other day I stumbled across an interesting article that discusses, among other things, the famous telescope and optical instrument manufacturing company, Grubb Parsons. The piece is a few years old but I didn’t see it when it came out. It’s well worth a read.

Grubb Parsons was still a famous company when I was at school, but it closed down in 1985. The main works were in Heaton, in Newcastle Upon Tyne, not far from where I was born; my father went to Heaton Grammar School.

Grubb Parsons made a huge number of extremely important astronomical telescopes, including the Isaac Newton Telescope, pictured above at the works in Heaton.

Interestingly, the names ‘Grubb’ and ‘Parsons’ both have strong Irish connections.

Howard Grubb was born in Dublin in 1844 and in 1864 he joined the optical instruments company set up there by his father Thomas Grubb. When his father died in 1878 Howard Grubb took over the Grubb Telescope Company and consolidated its reputation for manufacturing high quality optical components and devices. He was knighted in 1887.

Back in 1845 Thomas Grubb had helped build the famous ‘Leviathan‘ telescope for William Parsons, 3rd Earl of Rosse at Birr Castle in County Offaly.

Charles Algernon Parsons, who took over the Grubb Telescope Company after it was liquidated in 1925, and relocated it to Tyneside, was the youngest son of William Parsons ( just as Howard Grubb was the youngest son of Thomas). He no doubt kept the name Grubb in the company name because of its associated reputation.

Parsons had a wide range of business interests besides telescopes, mainly in the marine heavy engineering sector, especially steam turbines. When I was a lad, ‘C A Parsons & Company’ was still one of the biggest employers on Tyneside. It still exists but as part of Siemens and is a much smaller operation than in its heyday.

One final connection is that Sir Howard Grubb and Sir Charles Algernon Parsons both passed away in the same year, 1931.