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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

Lieutenant Brenske’s Marsch-Zirkel

Portfolio 1

Navigation in the days before Waze…

A slide rule with a Wow!

Portfolio 3

An ingenious and unusual form factor

Wynne-Roberts’ hydraulic calculator

Portfolio 5

A nifty little calculating device

Three “pencil” slide rules

Portfolio 7

The perfect gift for the calculating geek!

Five Intel chips that changed the world

Portfolio 9

When Intel enabled the personal computing era

The small Small Calculator

Portfolio 11

A full-fledged slide rule 5 cm in diameter

Victorian Virtual Reality

Portfolio 13

Mesdag’s Panorama

How the Slide Rule got its Cursor

Portfolio 15

Three centuries of innovation

A homebrew Single Sideband transmitter

Portfolio 17

A photo-essay for ham radio geeks

The gentleman and the carpenter

Portfolio 19

Two Coggeshall variants compared

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