From the back of the 128-page sourcebook:
"Smith & Robards are two of the most notorious of the so-called mad scientists in the Weird West, and they've built themselves quite an empire on their pledge to get you the latest gizmos built with bleeding-edge steam technology - no matter where you might happen to be.
This book features the entirety of the very first Smith & Robards mail-order catalog, featuring dozens of brand-new gadgets sure to drive any tinkerer insane with delight.
There are also all sorts of rules for vehicles like ornithopters, auto-gyro, submersible boats, and steam tanks, as well as how to use them in combat. Plus, there are four new archetypes for you to model your own heroes on.
Best of all, there's a whole new class of ghost-rock based science: alchemy. Soon your intellectual powerhouse will be mixing elixirs with the best of them.
Take it from the people who put the "mad" back into "mad scientist." You'd be crazy to let this book get away."