# With what microscope and pollen was the Browinian motion discovered?

It is said that Robert Brown discovered the Brownian Motion by looking at pollen grains with a microscope in 1827.

I wonder, did he look at pollen grains from a flower? And what kind of microscope was it that he used? I guess technology wasn't so good around 1827, right? Was it comparable to a nowadays reading lens?

By the 10 inch rule of thumb (the near object is best seen from 10 inches away, so the magnification is roughly 10/focal length) the magnification of Brown's microscope was then about $\times 320$, Brown's own estimate was $\times 370$. The two preserved Brown's microscopes, one at Kew Gardens and the other at the Linnean Society, have $\times 170$ lenses, so it probably was not one of them. The basic design goes back to Leeuwenhoek (1674), who already achieved magnification of $\times 300$ and observed bacteria through his microscope, see History of Microscopes timeline.