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% C.L. upper limit of $1.17\times 10^{-22}$ particles per nucleon on
the abundance of fractional charge particles in silicone oil for $0.18 e \le
|Q_{residual}| \le 0.82 e$. Since this is the first use of this new method we
describe the advantages and limitations of the method.Comment: 11 pages, 9 figures, 3 table
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