In order of importance within this website:
2. Wikipedia’s George Johnstone Stoney general history
3. Wikipedia’s working summary of the Stoney Scale
4. Wikipedia’s working summary of the Stoney units
5. The first paragraph of Stoney’s article, “On the Physical Units of Nature” (delivered, 1874, print edition, 1881)
The entire article is scrollable. It was first printed by the Royal Dublin Society yet it was presented in 1874 at the Belfast meeting of the British Association. This copy of the article was digitized by the Smithsonian Libraries and a growing consortium of the world’s leading libraries.