Promptuary
Promptuary is a mechanical calculator or mathematical instrument.
Overview
16th-century device to aid multiplication.
In detail
It is recorded as the work of John Napier.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
- 1.
“Promptuary”, English Wikipedia, consulted as further reading
reference work · Reputable secondary · Wikipedia
Consult the source - 2.
Wikidata, structured authority record Q7249900: Promptuary
reference work · Reputable secondary · Wikidata
Consult the source
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733 published records in this field, each with its sources named.
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Best supported in this field