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The funky IRMO calculator
A weird but powerful machine tool calculator
Beads, beads, and more beads!
Mankind's longest-running computer platform
An arithmetical ruler
A simple but nifty calculation aid
Vizzini’s Calculating Table
A minimalist calculator from Italy
Mario Loffredo’s elastic calculating scale
A lost precursor of the Gerber Variable Scale
A calculator hidden in a book
A truly intriguing device!
Kaufmann’s Posographe
A mind-blowing mechanism for exposure calculation
Meet E. W. Fritchley
A human connection across time and space
The Watkins exposure meter
Light metering, 19th century style
Build your own airplane!
The Hoffman Airplane Calculator
The Jeffers Calculator
Keeping farm animals healthy through a nutritious diet!
The Genaille-Lucas financial rods
An ingenious way of calculating with sticks
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