Abstract
We have carried out the largest search for stable particles with fractional electric charge, based on an oil drop method that incorporates a horizontal electric field and upward air flow. No evidence for such particles was found, giving a 95% confidence level upper limit of $1.17\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}22}$ particles per nucleon on the abundance of fractional charge particles in silicone oil for $0.18e<~|{Q}_{\mathrm{residual}}|<~0.82e.$ Since this is the first use of this new method we describe the advantages and limitations of the method.
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