Cornell’s Calculator in a Book

Cornell's Calculator in a Book 4

Some of the most fascinating items in my History of Computing collection are the one-of-a-kind, undocumented ones. The latest such addition to the collection is a calculator hidden in a book-like case, that has no mention anywhere that I could find. This is Charles Cornell’s F.24 aerial photography planning calculator, and you can read all … Read more

Innumeracy in the skies

Was on a United flight enjoying my coffee (such as it was), when I noticed the text on the paper cup. Nice cup: Makes them feel very ecological, no doubt… someone in Marketing must’ve though it a good point to brag about. Except that it’s completely meaningless, of course. This statement remains true even if … Read more

A beautiful instrument

This Barometer was made in Florence some 100 years ago, and served my late grandfather, first in Italy, then in Israel; it ended up on my wall, a family heirloom to delight the heart of any engineer. It is a large (23 cm across) Aneroid Barometer, an instrument to measure atmospheric pressure by means of … Read more

Definitely a good idea!

Single fluke anchor

Form follows function! Here is a row of anchors, which I photographed in Greenwich in the UK. You’ll note the one in the foreground has a single fluke (as the pointy ends of an anchor are called). The sign says this anchor is from around 1820. So why would they produce an anchor with only … Read more

How many engineers?

See the mechanic working on my Renault Clio. Do you know what he’s doing? Looks like he’s trying to squeeze his arm into a tiny space between some metal beams in the engine compartment frame. Why is he doing that? Because he wants to replace a burned out light bulb in the headlamp assembly. Actually … Read more

An elegant hydraulic calculator

Robert Owen Wynne-Roberts, MICE (Member of the Institution of Civil Engineers), FRSI (Fellow of the Royal Sanitary Institute), was a talented civil engineer. He passed away in 1935, but at least one result of his engineering talent abides: the Wynne-Roberts hydraulic calculator, a specialty circular slide rule for computing flow in water pipes and sewers. … Read more