Promptuarium multiplicationis
Calculating using strips, a device invented by John Napier
This rare and unusual tool, invented by John Napier in the 17th century and detailed in his work entitled Rabdology, is used to facilitate multiplication.
The attached booklet provides historical information, interesting facts, the tool’s mathematical features and instructions for use.
The 32 page booklet includes historical information, usage instructions and many interesting facts.
Technical information
Contents: case, 50 strips, 32 pages instruction booklet
Material: cardboard
Box: cardboard box 23 × 22 × 1 cm
Weight: 160 g
Retail price: € 24,90
