The Calculated Risk

The Calculated Risk
Anyone remember how to do division?

Photo sources:

Antique Vintage R.C. Allen Model 805
Mechanical Adding Figuring Machine
Buy it (as of 2014-01-19) for $99.95
from gwenna_baker on eBay

Harwell’s 1951 WITCH & IBM 305 RAMAC, 1956
Gadgets and Design blog

Woman at old computer terminal

Tektronix Model 31 Electronic Calculator
Old Calculator Museum

Vintage Texas Instruments
The Little Professor Electronic Calculator
from braegsalot on eBay

Spreadsheet screenshot (really!)

Modern desktop computer

Scientific Calculator desktop app

Calculator Cell App

Solar Flare