Abstract
A large-area (3.35 ${\mathrm{m}}^{2}$) scintillation-counter telescope consisting of six scintillation counters and four widegap spark chambers was arranged to detect single particles with charge $\ifmmode\pm\else\textpm\fi{}\frac{1}{3}e$ or $\ifmmode\pm\else\textpm\fi{}\frac{2}{3}e$ which might be present in the cosmic radiation near sea level. Upper limits to the vertical intensities of such particles are 9.8\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}11}$ ${\mathrm{cm}}^{\ensuremath{-}2}$ ${\mathrm{sec}}^{\ensuremath{-}1}$ ${\mathrm{sr}}^{\ensuremath{-}1}$ for charge $\ifmmode\pm\else\textpm\fi{}\frac{1}{3}e$ and 1.6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ ${\mathrm{cm}}^{\ensuremath{-}2}$ ${\mathrm{sec}}^{\ensuremath{-}1}$ ${\mathrm{sr}}^{\ensuremath{-}1}$ for charge $\ifmmode\pm\else\textpm\fi{}\frac{2}{3}e$ at a 90% confidence level.
Published Version
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