Charts that compute

Redrawn by us

Stanhope square demonstrator

Made by
Charles Stanhope
Year
c.1805
Field
Logic, language and computing
Kind
Physical object
Room
Charts that compute — Placed by reading its description, not yet studiedCould also hang in: Parts of a whole
Two strips slid across one whole, read by how much of them must overlap.
Drawn on made-up example data to show the form · A sketch, not yet tested with readers

What we kept from the original

Two strips slid across one whole, read by how much of them must overlap.

What we changed

Stanhope's demonstrator was an instrument for teaching logic; ours is a drawing for two event frequencies, and it marks the most overlap they allow as well as the least.

Skeleton drawing, not the original plate

55 other forms share this skeleton

Source

Science Museum Group collection, object 1953-353

Attribution less certain: contested, or no single inventor recorded

Searches, not citations

archive.orgcommons.wikimedia.orgscholar.google.com