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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

Leib Stern’s slide rule

Portfolio 1

An unusual slide rule from an unusual source

Krüger’s calculating pencil case

Portfolio 3

A computer for every child, 1909 style

Gunter’s rule

Portfolio 5

One step before the slide rule

Webb’s Adder

Portfolio 7

One curiously shaped calculator!

Biorhythmic calculators

Portfolio 9

Where computing meets Pseudoscience

It’s a wonderful Life!

Portfolio 11

Conway’s Game of Life — and a Freeware implementation

The Dimensator

Portfolio 13

Michaelis’s reinforced concrete calculator

The Ken+Add, inside and out

Portfolio 15

Small adder, big quality

Hand wired Memory!

Portfolio 17

What passionate hobbyists did back in the day

Farmar’s profit calculator

Portfolio 19

It slides, it rolls… and it calculates!

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