A description of the Pascaline given in a letter of Sir Balthazar Gerbier to Samuel Hartlib. From the Hartlib Papers, Paris (October 1649).
Image copyright © 2002 The University of Sheffield,
http://www.archiveshub.ac.uk/inst/sheffield.shtml, accessed 29 August 2004.
A 6-digit Pascaline opened, showing the sequence of wheels, each carrying ten teeth. In the Conservatoire des Arts et Métiers, Paris, from http://www.thocp.net/hardware/pascaline.htm (accessed 29 August 2004).