Captain Charles Ryder was in charge of survey work on the Younghusband expedition to Tibet in 1904. During this expedition he measured the height of Mount Everest with remarkable accuracy as 29,002 feet (now given as 29,029 feet).

Documents

• Survey of India Report 1903-1904 (Tibet).
  
• Survey of Tibet news cutting.
  
• Lecture on Tibet 1905
• Map of survey 1904.
• Feature article on Mount Everest in The Sphere 1921.
  
• Letters to his wife Ida from Tibet while surveying with Sir Francis Younghusband's expedition.

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Believed to be of the Everest massif.

Panorama of Lhasa with the Potala palace.

Below is a slide show of 229 of Charles' photographs. Very few are labelled, some I have attempted to identify, suggestions invited.