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Archives: Portfolio

A portfolio type for featuring items in your portfolio.

Psychrometric slide rule

Portfolio 1

A relative humidity calculator

Illustrated Natural Philosophy

Portfolio 3

The charm of 19th century scientific illustrations

Stephens’ “Supremathic”

Portfolio 5

A completely different circular slide rule

 El Calculador!

Portfolio 7

A Spanish multiplication aid

Glass and Paper?!?

Portfolio 9

The ALKU glass slide rule

Homemade hydrological slide rule

Portfolio 11

Handcrafted with amazing workmanship

Enter the Altair!

Portfolio 13

And the rest is history…

A bill full of holes

Portfolio 15

An electricity bill from the mainframe era

A Victorian “Calculator”

Portfolio 17

A must-have for the enterprising farmer!

Software by the yard

Portfolio 19

Punched paper tape storage

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