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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

The real thing, in cross-section

Portfolio 1

How to teach what makes things tick

The Jeffers Calculator

Portfolio 3

Keeping farm animals healthy through a nutritious diet!

The Pose-Marre pen slide rule

Portfolio 5

An elegant device of mysterious origins

Bloch’s Gewicht-schnellrechner

Portfolio 7

A mechanical nomogram for weight calculations

The Ross Precision Computer

Portfolio 9

Accurate to five decimal places!

Torsion wire delay line memory

Portfolio 11

A forgotten storage technology

The Genaille-Lucas financial rods

Portfolio 13

An ingenious way of calculating with sticks

Martin’s huge multiplication table

Portfolio 15

A tool from the time of Napoleon

Lalanne’s glass slide rule

Portfolio 17

An unusual but sensible choice

Jacob Zedak’s wooden slide rule

Portfolio 19

Very nicely made!

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