Masters of Light and Iron: The Rise and Legacy of the Grubb Telescope Company
Donnacha O’Driscoll
- Tuesday September 22, 2026
- 10:30 – 12:30
- Newtownpark Pastoral Centre (map)
This presentation explores the pivotal yet often underappreciated role of the Grubb Telescope Company in the advancement of astronomical instrumentation during the 19th and early 20th centuries. Founded in Dublin by Thomas Grubb and later expanded by his son Howard, the firm emerged from a tradition of precision engineering to become a world-leading manufacturer of large-scale refracting and reflecting telescopes.
We will trace the company’s journey from its early commissions for Irish observatories to its international acclaim, supplying major instruments across the British Empire and beyond, such as the magnificent 27” Vienna refractor and the great Greenwich Equatorial telescope. The Grubb family’s key innovations in telescope mount design, clock drives, and optical fabrication, set new standards for stability, precision, and ease of use. These technological breakthroughs not only enabled groundbreaking astronomical discoveries but also cemented the company’s reputation for unparalleled craftsmanship.
Finally, the talk will address the challenges faced by the Grubb company, including increased competition and financial pressures, which ultimately led to the company’s acquisition and transition into the renowned Sir Howard Grubb, Parsons & Co. By examining the company’s origins, triumphs, and eventual decline, this presentation will argue that the Grubb Telescope Company was a fundamental catalyst in the professionalization of astronomy, bridging the gap between the era of the gifted amateur and the dawn of modern astrophysics.
Donnacha is a scientist by profession, receiving a BSc in UCC in 1987, a PhD in UCD in 1991 and an MBA in DCU in 2000. He is the General Manager of the Research Ireland research centre ‘Insight’ in UCD. Although professionally he has worked in the biotechnology and data analytical sectors, his passion is in astronomy and in particular Lunar astronomy. He has been an active observer of the Moon for over 40 years and has presented many talks on the subject in that time. He established and runs the outreach website www.themoon.ie. Donnacha was recently elected president of the Irish astronomical Society where he also leads the Lunar Observation Group.
