The fight for water Richard Arkwright's water-powered mill at Cromford opened in 1771, and the factory system that followed created fierce demand for the best river sites. Water-powered mills were also dependent on the weather: a dry season could shut down the factory.

Steam pumping engines offered a solution. An engine lifted the water that had passed beneath the wheel back up the hill, allowing the same water to fall through the wheel again. This kept the smooth turn of the water wheel, but wasted coal moving the water. Watt sold sixteen to twenty horsepower pumping engines to deliver ten horsepower to the machines.

Watt's double-acting engine, beam, crank and flywheel let the engine directly turn the line shaft. This met a huge demand from mill owners who wanted to build near workers and materials rather than around a particular stretch of river.11 One problem remained, though: every time a machine was turned on or off, the load on the engine changed.

I had thought about talking more deeply about the difference between them, but the article was already getting too long! It's certainly worth a footnote though. Revision upcoming :).

It's a mixture of techniques. Using fully rigged CAD models is a huge help, it ensure physically realistic motions. Then, I built a custom exporter / renderer to render them realistically in CAD style.

For a lot of the animations, I first develop storyboards to cover the main beats, and decide on what would be interactive or not. Then a lot of iteration with Fable (and Opus 5.5 now!) on how to show things clearly. A lot of time is spent trying to show the key ideas visually. Eg. in the bench micrometer adding an overlay with the size of the micrometer closing over the part, as well as showing the screw spinning was a big improvement in "readability".

The text was hand written, but reviewed by AI and light edits were made. The CAD models that drive a lot of the animations were either sourced or built based on pictures of historical machines. As called out in the credits, the interactive figures were built by myself and Claude Fable 5 (mostly - a bit of Opus 5.5 in there now).

The article itself was built over about 4 months.

I started digging into Watt's challenges getting an accurate cylinder bore for his pistons, and it spiraled out from there :).

The article covers some of the key techniques developed during the industrial revolution to measure and make incredibly precise parts. There are a lot of animations and interactive figures to explore how it works.

Comments URL: https://news.ycombinator.com/item?id=49980626

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Great point on steel not being an option, I should have mentioned that.

RE: Hartford Steam Boiler Inspection - cool, thanks for the details!

RE: safety valve, pressure gauge, etc. - yes, there is definitely another article to be built here :). Another fun aspect is safely starting the machine, warming it up appropriately, flushing water from the system, and the bigger engines even had a small engine to get the wheel turning.

And https://modelengineeringwebsite.com/Classic_ME_beam_engine.h... is almost exactly the CAD model behind this beam engine. Designing that on paper would have been quite a challenge.