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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Bulgarian MilitaryBulgaria
est. 1960'sDia. = 20 cmNuclear Damage

Notes: 1) Used to determine radiation dosage from a nuclear explosion 2) Similar to the East German version where the angel to the top and bottom of the mushroom cloud and the distance is used in the calculations. 3) This slide rule has a main disk with an additional 3 concentric disks on the front side and 2 concemtric disks on the reverse side

Image 1

Image 2