Abstract
The track-density of the Bristol κ1-meson has been determined photo-electrically. The measurements have been accurately corrected for uneven development and transparency of the emulsion. The mass has been calculated by comparison with tracks which have roughly the same slope as the meson-track and also by comparison with a proton track which crosses that of the meson. The result of the mass-determination is mκ1= 1518±70 electron masses.

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