Stock No. C1112



A boxwood pocket sundial 
by  Negretti & Zambra, London

  • A boxwood pocket sundial signed on the compass dial paper Negretti & Zambra, London.
  • Dials of this type are known as diptych dials. This dial dates from the second half of the 19th century
  • The hinged boxwood instrument opens to reveal a compass and sundial in the base and a circular paper disc in the lid with a printed equation of time.
  • The lid is held open by a brass latch which keeps the string gnomen under tension. The sundial is graduated from 4 am to 8 pm in quarter hour intervals.
  • The compass is graduated in one degree intervals and has a 16 point compass rose to the centre. When the dial is closed a small pin operates a lever to stop the compass needle rotating.
  • The instrument measures 3 x 2 x when closed.

Henry Negretti and Joseph Zambra became partners in 1850 and were one of the major makers of scientific instruments in the 19th and early 20th century.


Additional photographs


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