I was at a museum, and I asked a worker there if we were allowed to take pictures.
He told me no, as they had to stay on the walls.
Found on Twitter BytownMuseum posted on 16 Jun 2019
Henry Augustus RowlandBorn 27 Nov 1848; died 16 Apr 1901 at age 52. American physicist who invented the concave diffraction grating, which replaced prisms and plane gratings in many applications, and revolutionized spectrum analysis--the resolution of a beam of light into components that differ in wavelength. His first major research was an investigation of the magnetic permeability of iron, steel and nickel, work which won the praise of Maxwell. Another experiment was the first to conclusively demonstrate that the motion of charged bodies produced magnetic effects. In the late 1870s, he established an authoritative figure for the absolute value of the ohm, and redetermined the mechanical equivalent of heat in the early 1880s, demonstrating that the specific heat of water varied with temperature. |
