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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

Torsion wire delay line memory

Portfolio 1

A forgotten storage technology

The Genaille-Lucas financial rods

Portfolio 3

An ingenious way of calculating with sticks

Martin’s huge multiplication table

Portfolio 5

A tool from the time of Napoleon

Lalanne’s glass slide rule

Portfolio 7

An unusual but sensible choice

Jacob Zedak’s wooden slide rule

Portfolio 9

Very nicely made!

The Data Scaler Proportional Rule

Portfolio 11

A Gerber Variable Scale clone

The Controller slide rule family

Portfolio 13

All four of them!

Pretty as a picture!

Portfolio 15

The Arnault-Paineau calculator

Badalamenti’s factorization slide rule

Portfolio 17

Well, not exactly a slide rule…

Meet a Mathematical Inventor!

Portfolio 19

Jean-Antoine Lafay’s Hélice a Calcul

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