cardboard disc
Portugal
18th Century
Recipe Details
Ingredients
cardboard
Evidence
"The cardboard disc is mounted between two spikes so that it can rotate. On its reverse the iron wire in the form of a rhombus is affixed."
Remarks
The cardboard disc serves as the rotating component of a Ship's Compass, based on a Portuguese original from the 18th century. It is protected by glass inserted into the crown (p. 75).
Scientific Analysis
Certainty Level
Inferred
Instrumentally Verified
Not Verified
Metadata
Material Type
paper
Paper Typecardboard disc
RegionPortugal
Approx. Year1750
Source Information
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