ada lovelace daguerreotypes uk national portrait gallery 2735593

The National Portrait Gallery in London has acquired the only surviving photographs of 19th-century mathematician Ada Lovelace, a group of three daguerreotypes that were originally offered at Bonhams in June 2025 with an estimate of £80,000 to £120,000. The lot was withdrawn from auction and the museum secured it via a private treaty sale, a confidential negotiation process that allows institutions to purchase significant artworks directly from private owners. Two of the daguerreotypes were taken by French photographer Antoine Claudet around 1843, the year Lovelace published her foundational paper on Charles Babbage's Analytical Engine, while the third, by an unknown photographer, reproduces an 1852 portrait by Henry Wyndham Phillips showing Lovelace near the end of her life.