Portraits of the inventor
This is Sir William Robert
Grove (1811-1896). Grove was a Welsh lawyer and professor of physics.
He is known for his work as an inventor of batteries, including nitric
acid cell batteries used for the American telegraph (1840s-60s), and
gas votaic batteries which were the forerunners of modern fuel cells.
The first portrait is a calotype taken by Adamson and Hill in 1844. The
other is a daguerrotype by Antoine Claudet in 1849.