Summary The emergence of quantum theory in the early decades of the twentieth century was accompanied by a wide range of popular science books, all of which presented in words, and a few in images, new scientific ideas about the structure of the atom. The work of physicists such as Ernest Rutherford and Niels Bohr, among others, was pivotal to the so-called planetary model of the atom, which, still today, is used in popular accounts and in science textbooks. In an (...) attempt to add to our knowledge about the popular trajectory of the new atomic physics, this paper examines one book in particular, co-authored by Danish science writer Helge Holst and Dutch physicist and close collaborator of Niels Bohr, Hendrik A. Kramers. Translated from Danish into four European languages, the book not only explained contemporary ideas about the quantum atom, but also discussed unresolved problems. Moreover, the book was quite explicit in identifying the quantum atom with the atom as described by Bohr's theory. We argue that Kramers and Holst's book, along with other ‘atomic books’, was a useful tool for physicists and science popularisers in trying to understand the new quantum physics. (shrink)

Denmark was once at the forefront of nuclear research, operating three experimental nuclear reactors at the research facility at Risø, close to Copenhagen. However, the 1985 resolution of the Danish Parliament excluded nuclear power from the national energy mix. In 2003, the Parliament passed a resolution on the decommissioning of the nuclear facility at Risø, including plans for establishing a permanent solution for radioactive waste management. To understand the ensuing socio-technical controversy, we employ the “hybrid forum” framework that emphasizes the (...) entangled political-epistemological role of the municipalities and protest groups. They mobilized political resistance while also performing “research in the wild.” In 2016, the protest groups became part of an institutionalized “hybrid forum” where they could negotiate directly with experts and government representatives. We conclude that municipalities and protest groups were instrumental in changing the Danish position on radioactive waste management from final repository to long-term storage at Risø. (shrink)

This paper traces the origins of two technological trajectories in the contemporary history of wind power technology: the American Smith-Putnam Wind Turbine and the Danish Gedser Wind Turbine. Describing the two wind turbine projects in terms of their technical design characteristics, the professional background of the individuals involved, the organizational features of the technological knowledge production, and the historical context, the paper builds on the notion of technological trajectories in the making as a means of identifying emerging selection mechanisms for (...) possible engineering problem solutions, scientific methods, material artifacts, and financial assessment techniques. Conceived during the Great Depression and World War II, respectively, both projects promoted the idea that wind power could make a cost-effective contribution to the existing electric utility system. The two projects resulted in distinctive wind turbine innovations that paved the way for two technological trajectories in the contemporary history of wind power. Studying the emergence of technological trajectories, it is argued, requires the historian of technology to attend to well-known features of technological design and its cultural context that in retrospect appear to be significant, but also to tackle the creation of novelty and the inevitability of technological uncertainties about which the logic of trajectories has little to say. (shrink)