What is associated with: around 1850 helmholtz clocked impulses moving along these body parts at about 90 feet per second?

What is associated with: around 1840 chemist john william draper took the first photograph of this heavenly body? What is associated with: around 1846 sarah bagley became the first female operator of this device? What is associated with: around 1850 george boole devised a new take on this branch of math? What is associated with: around 1850 he absolutely positively came up with the idea for an absolute temperature scale? What is associated with: around 1850 it used a fleet of over 700 ships by 1930 this us industry was practically defunct? What is associated with: around 1850 you could find eugene delacroix painting the ceiling of this french museums salon… What is associated with: around 1862 this american locksmith introduced a dial operated combination lock for bank vault… What is associated with: around 1862 this doctor invented a machine gun that could fire about 350 rounds per minute?