Ciphering Apparatus by J Tyrrell, patented 1830, (apparatus for teaching basic arithmetic) (B507; A242624)
- Object Number:
Ciphering apparatus booklet (open): 200 mm x 220 mm x 3 mm,
Closed Box: 60 mm x 250 mm x 160 mm, 1 kg
Open Box: 181 mm x 250 mm x 160 mm, 1 kg
- cipher demonstrators
- On loan from the Wellcome Trust
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