The image is a vintage scientific diagram, likely from a physics or chemistry textbook. It's a black and white line drawing depicting a circular arrangement of shapes, labeled 'Radium-centre 819 atoms' and 'Plate XXII'. The diagram features a central point from which radial lines extend outwards, dividing the circle into numerous wedge-shaped sections. Within each section, there's a roughly oval or almond-shaped outline containing a cluster of small dots. These dots seem to represent atoms or particles. The arrangement suggests a model of atomic structure or a depiction of a radioactive substance like radium, with the dots indicating the distribution of atoms around a central point. The style is reminiscent of early 20th-century scientific illustrations, with precise lines and a focus on conveying information rather than artistic expression. There's a number '12' at the bottom left corner of the image.