At the top of the scaffold, the arch! In Volume 1, Duncan and Janssen told the intricate story of the long struggles in the first twenty years of the emergence of quantum mechanics. Now, in The Arch, they give a definitive analysis of the climactic and brilliant mid-1920s, with the formulation of matrix and wave mechanics. It is an extraordinary achievement: all future work on this topic starts here.
Jeremy Butterfield, University of Cambridge
Duncan and Janssen have done something courageous and even audacious. They have surveyed the sprawling, multi-stranded, twenty-seven year saga of the birth and consolidation of modern quantum mechanics and produced a systematic description of the main conceptual advances, in historical context. I expect it will become a unique reference for interested scientists and historians.
A. Douglas Stone, Yale University
The book is rendered suitable for classroom use, albeit at the higher undergraduate or graduate levels.
Steven French, The British Journal for the History of Science