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This report presents preliminary results of a search for high redshift quasars based on the Palomar Transit Grism Survey of Schmidt, Schneider \& Gunn. The original survey covers $\sim$ 60 square degrees of the sky with low-resolution slitless spectra of approximately 600,000 objects in the wavelength range from 4400~{\AA} to 7500~{\AA} and was designed to find emission line candidates of a given signal--to--noise ratio and equivalent width.
Our goal is to establish whether there is a significant number of high redshift quasars with weak or narrow emission lines by searching for objects with a continuum depression blueward of the Lyman break. In addition to providing an interesting sample of quasars with different emission line properties, these objects could explain the steep decline in the comoving space density of strong emission line quasars at redshifts higher than $\sim$ 2.5. The follow--up observations will be carried out with the new spectrograph at the 3.5m ARC Telescope, Apache Point, NM.
