Hermann von Helmholtz (1821–1894) was a luminary in the realm of 19th-century science, contributing monumentally to the understanding of physiology, optics, electrodynamics, mathematics, and metrology. One of his pivotal works, 'On the Conservation of Force' (1847), established the law of conservation of energy, an indispensable foundation for physical science. Helmholtz's interdisciplinary expert...