Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Pocket Watch Slide Rules
Halden / Calculex Desktop
Halden (Joseph)
UK
Metal/glass/paper
1915
Ø 12.7 cm
Basic Calculations

Notes: Impressive and easier to use larger version of the true pocket version with identical scales.


Image 1




Image 2




Image 3




Image 4




Image 5




Image 6