| 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 illustrations of the  various instruments and a complete price list of Browning's lenses and  other apparatuses provide important insight into his business practices  and range of expertise. Designed for the lay enthusiast no less than the  dedicated scientist, these volumes are also valuable witnesses to the  growth of popular science in nineteenth- and early twentieth-century  Britain.  | 
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