Circular regarding reporting of space projectiles

This document is a circular issued by the Royal Board of Customs (Kungl. Generaltullstyrelsen) in Sweden, referencing a request from the Head of the Defence Staff dated October 28, 1946. The purpose of the circular is to instruct customs personnel, including coastal and border surveillance staff, on the proper procedure for reporting observations of so-called 'space projectiles' (rymdprojektiler). Personnel are directed to report sightings immediately via telephone or telegram directly to the Air and Air Defence Department of the Defence Staff. The circular outlines specific criteria for these reports, which should include the observer's location, the time of the sighting, the direction of the phenomenon, the angle of elevation, the course, and a description of the phenomenon. Detailed instructions are provided for determining the time (to within one minute, synchronized with Swedish standard time), estimating duration, and measuring direction using a compass where possible. Observers are also asked to note any observed vertical movement, whether the course was straight or zigzagged, and any associated radio interference or light. The document emphasizes that reports should be made only when observations can be stated with certainty.