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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

The Data Scaler Proportional Rule

Portfolio 1

A Gerber Variable Scale clone

The Controller slide rule family

Portfolio 3

All four of them!

Pretty as a picture!

Portfolio 5

The Arnault-Paineau calculator

Badalamenti’s factorization slide rule

Portfolio 7

Well, not exactly a slide rule…

Meet a Mathematical Inventor!

Portfolio 9

Jean-Antoine Lafay’s Hélice a Calcul

Lieutenant Brenske’s Marsch-Zirkel

Portfolio 11

Navigation in the days before Waze…

A slide rule with a Wow!

Portfolio 13

An ingenious and unusual form factor

Wynne-Roberts’ hydraulic calculator

Portfolio 15

A nifty little calculating device

Three “pencil” slide rules

Portfolio 17

The perfect gift for the calculating geek!

Five Intel chips that changed the world

Portfolio 19

When Intel enabled the personal computing era

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