I would like to thank the Verne-scholars and scientists
William Butcher, Volker Dehs and Randall Osczevski
– for insightful help, comments and material.
Many thanks also to the local historians,
at Rjukan; Torbjørn Myhre, at Kongsberg; Vidar Skaar Borgersen and in Drammen; Jo Sellæg
– who have provided valuable info and illustrations.
I would also like to acknowledge the debt I owe to text consultant Arne Engelstad
Per Johan Moe, 2010