Universal equinoctial dial and armillary trigonometer by James Ferguson

Universal equinoctial dial and armillary trigonometer

James Ferguson

Fine art poster

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  • Amazing giclée print quality
  • 280gsm thick fine art print paper
  • 100+ year colour guarantee
  • Dimensions:
    • x cm including border ( x in)
    • x cm excluding border ( x in)
£22.95

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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.

Read more about our fine art prints.

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.

Delivery & returns

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.

Universal equinoctial dial and armillary trigonometer by James Ferguson zoom

Universal equinoctial dial and armillary trigonometer

Universal equinoctial dial for all latitudes. It has a shaped wooden base and back support. The main brass disc of the instrument is bolted through its centre to the support and is free to revolve in a vertical plane. This disc has another rotatable disc set within it. One semicircle of the outer disc is hinged and can be moved to measure the azimuth of the sun. Behind this semicircle are scales for correcting the observed altitude of the sun and for the equation of time. This instrument was designed by Mungo Murray, a shipwright, and was first seen by James Ferguson in 1757. Ferguson later made his own version and wrote a short tract about its use. The tract explains many uses for solving problems of astronomy and spherical trigonometry, and for constructing pedestal horizontal dials and mural dials.
James Ferguson

  • Image reference: D8943

Discover more

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