In this important new work, the author provides a unique perspective on the creation of a scientific discipline. John Brand combines firsthand knowledge of the methods and procedures of spectroscopy with a careful exposition of the key technical and scientific advances that have brought dispersive spectroscopy to its present maturity. The reader meets the individuals who have contributed to this field, and learns of their trials as well as their breakthroughs. From 1800 to 1930, Brand preserves the thread of scientific thought and activity through six generations of working scientists.