Transit instrument by Troughton Dollond

Transit instrument

Troughton Dollond

Fine art poster

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We use a 280gsm fine art paper and premium branded inks to create the perfect reproduction.

Our expertise and use of high-quality materials means that our print colours are independently verified to last between 100 and 200 years.

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Manufactured in the UK

All products are printed in the UK, using the latest digital presses and a giclée printmaking process.

We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.

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We print everything to order so delivery times may vary but all unframed prints are despatched within 2-4 days via courier or recorded mail.

Delivery to the UK is £5 for an unframed print of any size.

We will happily replace your order if everything isn’t 100% perfect.

Transit instrument by Troughton Dollond zoom

Transit instrument

In July 1816 Edward Troughton's ten foot (3 m) transit instrument telescope replaced Bradley's earlier instrument, and reconfirmed Bradley's meridian as the prime meridian for the Royal Observatory, Greenwich, until December 1850. The telescope itself was regularly calibrated by taking sightings off a number of distant markers. In 1824 a granite obelisk was erected at Chingford, Essex, some eleven miles (18 km) to the north. The Bradley Obelisk, as it is known, still stands.

The telescope was commissioned by the Astronomer Royal John Pond after the mural circle (AST0973), installed a few years earlier had been found insufficiently stable for taking accurate transit observations. On the centre of the telescope's axis the maker has inscribed: 'Designed and Executed for the Royal Observatory by Edward Troughton, London, 1816' on one side and on the other 'To the President of the Council of the Royal Society this and the Mural Circle, being his greatest and best works, are dedicated by the maker'. The telescope now sits (and has done since 1967) on replica piers in the same site in which it sat in 1816.
Troughton Dollond

  • Image reference: D7061

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