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The bolded passage from the manuscript reads: ”The psychic phenomena are
non-spatial, yet for us, spatial relations obviously provide the only ­possibility of measurement. All measurements occur in such a way that spatial ­coincidences ­(readings on a galvanometer, the positions of the hands of a clock etc.) are ­observed.” (Moritz Schlick’s Nachlass, Inv.-Nr. A. 97-1. p. 9, reverse side)