John Browning (1830 1925) was the leading British manufacturer of precision scientific instruments, including spectroscopes, telescopes, microscopes, and opthalmoscopes. In How to Work with the Spectroscope (1878), he provides a complete overview of the field in which he was the undisputed expert, describing in detail the care and use of instruments ranging from the universal spectroscope to the star spectroscope to the induction coil. This volume also includes Browning's A Plea for Reflectors (1867), in which he provides an introduction to the silvered-glass reflecting telescope. Numerous...