• The volumes from the 1911 census have been preserved in their original bindings for 98 years.
• The volumes occupy over 2 kilometres of shelving at The National Archives in Kew, where they are kept in climate-controlled conditions.
• There are two series of records and both have been scanned:
RG 78 Enumators’ Summary Books (38,000 volumes), prepared by the official who issued and collected the information in 1911
RG 14 Household Schedules – individual forms for around 8 million households (35,000 volumes), completed by the head of each household
• In digital form, the census still takes a lot of storage capacity:
Over 16 million full colour images at 300dpi, 24-bit Tiff files
Over ten times the number of images created in advance of the 1901 census that was launched online in 2002
The census requires almost 0.5 petabyte (500 terabytes) of computer memory
It physically takes up 800 ultra-high capacity data tapes
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