Chris Osburn's Calculating Instruments

Featured Item

Keuffel and Esser 68-1210

Recently Acquired

Pickett N515

• all slide rules
• by size and type
• manufacturers
• countries
• master index

Featured Item

Farmar's Wine and Spirit Rule

Recently Acquired

Jeppesen CR-3

• all analog calculators
• by type
• manufacturers
• countries
• master index

Featured Item

Contina Curta Type II

Recently Acquired

Счетмаш Феликс М

• all mechanical calculators
• by type
• manufacturers
• countries
• master index

Featured Item

Texas Instruments TI-30

Recently Acquired

Hewlett Packard HP-97

• all electronic calculators
• by type
• manufacturers
• countries
• master index

Featured Item

OLPC XO-1

Recently Acquired

Psion Organiser II Model LZ

• all portable computers
• manufacturers
• countries
• master index