Readers of the series lived with Harry, but also with Rowling, as the almost-visible engineer of a great fantasy machine that, in the course of seven volumes, runs with remarkable smoothness.

NEWYORKER: Mugglemarch

The diary was written by Post Office engineer Tommy Flowers who designed the codebreaking machine.

BBC: Wartime diary helps to tell Colossus story

The Nazi angle takes Cook to Austria, where he visits the family of the late Viktor Schauberger, a forestry engineer and inventor who experimented with a machine called a Repulsine.

FORBES: Magazine Article

Enlisting the help of an engineer, Whelan has spent the past 18 months perfecting the machine and has created a highly adaptable device which snaps on around the wheel of the bicycle.

CNN: Virtuous cycles

"I'm not a mechanical engineer, but I saw a way to increase output of the machine by about 50%, " he says.

WSJ: IBM Creates Volunteer Teams

"People you wouldn't expect to put a lot of force on a machine can really crash and bash them about, " says Robert Green, a Dyson senior design engineer.

WSJ: Cleaning Products Get Stronger Even Though Scrubbers Insist On Using Elbow Grease