According to the Discworld reading order guide (v3.0), Moving Pictures is the first book in the Industrial Revolution thread of Discworld books.
Terry Pratchett – Moving Pictures (1991)
(Discworld #10, Discworld – Industrial Revolution #1) 🎧
‘Holy wood is a different sort of place. People act differently here. Everywhere else the most important things are gods or money or cattle. Here, the most important thing is to be important.’
People might say that reality is a quality that things possess in the same way that they possess weight. Sadly alchemists never really held with such a quaint notion. They think that they can change reality, shape it to their own purpose. Imagine then the damage that could be wrought if they get their hands on the ultimate alchemy: the invention of motion pictures, the greatest making of illusions. It may be a triumph of universe-shaking proportions. It’s either that or they’re about to unlock the dark terrible secret of the Holy Wood hills – by mistake..
Note 1: 🎧 the unabridged audiobook for Moving Pictures is narrated by Nigel Planer, 🎧 the abridged audiobook for Moving Pictures is narrated by Tony Robinson.
❝No-one would have believed, in the final years of the Century of the Fruitbat, that Discworld affairs were being watched keenly and impatiently by intelligences greater than Man’s, or at least much nastier; that their affairs were being scrutinised and studied as a man with a three-day appetite might study the All-You-Can-Gobble-For-A-Dollar menu outside Harga’s House of Ribs…❞
(“No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man’s and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a microscope might scrutinise the transient creatures that swarm and multiply in a drop of water.”
— H. G. Wells’ War of the Worlds.)
❝It was the sort of thing you expected in the Street of Alchemists. The neighbours preferred explosions, which were at least identifiable and soon over. They were better than the smells, which crept up on you.❞
❝Azhural raised his staff. “It’s fifteen hundred miles to Ankh-Morpork,” he said. “We’ve got three hundred and sixty-three elephants, fifty carts of forage, the monsoon’s about to break and we’re wearing… we’re wearing… sort of things, like glass, only dark… dark glass things on our eyes…”❞
❝”Did I hear things, or can that little dog speak?” said Dibbler. “He says he can’t,” said Victor. Dibbler hesitated. “Well,” he said, “I suppose he should know.”
— Dibbler meets Gaspode the Wonder Dog❞
 The Annotated Pratchett File v9.0 – Moving Pictures
 Moving Pictures (From Wikipedia, the free encyclopedia)