The monument has been closed to visitors but is undergoing essential works, including the restoration of the historic time ball. 

Designed by Robert Burn to resemble an upside-down telescope, the Nelson Monument was completed in 1815 to commemorate Vice Admiral Horatio Nelson’s death and the British victory over the French and Spanish naval fleets at the Battle of Trafalgar. 

A time ball was added in the 1850s by Astronomer Royal, Professor Charles Piazzi Smyth, to help sailors in the Firth of Forth keep time and navigate accurately. Once synchronised with Edinburgh Castle’s one o’clock gun, the time ball has since fallen into disrepair and is currently out of service.;

Managed by Museums and Galleries Edinburgh, it is hoped that the Nelson Monument will reopen later in 2024 following structural fabric assessments and rehabilitation works.

Leading the works, Stuart Fleming, director at civil and structural engineering firm Will Rudd Edinburgh, said: “As a structural engineer, with great interest in historic buildings who has seen this monument as part of the historic skyline of Edinburgh since I was a boy, it is incredibly exciting to be able to work on its restoration.

“Time balls are largely obsolete in modern day naval navigation, but with only a handful remaining in the UK and across the world, it is so important that we preserve them where we can, and keep this one in working order.

“We have worked closely in-house with our own expert conservation engineers, led by our Glasgow office managing director and Conservation Accredited Engineer, MJ O’Shaughnessy to ensure the engineering sensitivities of this Monument are treated appropriately. 

“Like many tourists and the Edinburgh public, we are keen to see the tower open for use once again. We are working flexibly with the City of Edinburgh Council to allow them to bring the museum and other facilities into use when needed during our works.”

MJ O’Shaugnessy, managing director of Will Rudd Glasgow, who carried out the conservation engineering review, said: “From a conservation engineering perspective, the primary objective was to ensure that any interventions to the building’s fabric were both appropriate and feasible, given the monument’s historical significance and its prominence in a heavily trafficked public space.

“The restoration of the timeball, in particular, requires delicate and expert craftsmanship, to be carried out in a safe, controlled workshop environment. The repairs will focus on preserving the spirit of the original timeball by using matching materials and techniques where possible, while placing a renewed emphasis on durability. This approach ensures the fabric is protected and can continue to be appreciated for many years to come, ultimately safeguarding the legacy of this historically important building.

“As conservation engineers, it is a privilege to be involved in the restoration of such a prominent feature and landmark.”