Prov nr 23 (Sample No. 23) - Holmsjön - Aldersjön

This document, dated August 25, 1946, details the analysis of 'Sample No. 23' by the Swedish research agency FOA. The sample was discovered by Nils Örne, an engineer at the Alby new chlorate factory, and Viking Svensson, a foreman, while they were on a fishing trip between Holmsjön and Aldersjön. The witnesses reported finding the metallic fragments scattered over a small area on the shore, noting that the items appeared to have been subjected to intense heat. The recovered material consisted of two pieces of white metal forming an incomplete ring, along with three strips of tinned 1 mm copper plate, one of which had a threaded bolt fastened to it. Technical examination revealed that the ring had partially melted, with significant blackening around the affected area, suggesting an asymmetrical heat source. The ring measured approximately 133 mm in outer diameter, 29 mm in width, and 7.5 mm in thickness. The material exhibited a coarse crystalline fracture and appeared to be cast. Marks found on the outer surface at 120-degree intervals indicated that other components had previously been attached to the ring. Qualitative spectral analysis identified the primary material as zinc, with a low copper content and potential traces of lead. The report notes that the bolts showed no signs of deformation from explosion or extreme heat, leading investigators to conclude that the components were likely removed by unscrewing rather than by force. The simplicity of the assembly suggested that the parts were intended for mass production.