Riddle

51.516494, -0.144989 (OpenStreetMap, Google Maps, Yandex Maps)

This Londoner became famous after he managed to measure the mass of a specific object. Ironically, the garden on the square that shares the name with him is shaped as the object he ‘weighed’. Stone slab in the middle of the square.
Second-to-last word of the second-to-last line of the engraving

Detailed answer

Henry Cavendish, among other things, managed to estimate the mass of the Earth. The garden on Cavendish Square has an unusual round shape (similar to the projected shape of the Earth).

Answer: Publick


Publick

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