  We present a description of the Prototype All-Sky Imager (PASI), a backend
correlator and imager of the first station of the Long Wavelength Array (LWA1).
PASI cross-correlates a live stream of 260 dual-polarization dipole antennas of
the LWA1, creates all-sky images, and uploads them to the LWA-TV website in
near real-time. PASI has recorded over 13,000 hours of all-sky images at
frequencies between 10 and 88 MHz creating opportunities for new research and
discoveries. We also report rate density and pulse energy density limits on
transients at 38, 52, and 74 MHz, for pulse widths of 5 s. We limit transients
at those frequencies with pulse energy densities of $>2.7\times 10^{-23}$,
$>1.1\times 10^{-23}$, and $>2.8\times 10^{-23}$ J m$^{-2}$ Hz$^{-1}$ to have
rate densities $<1.2\times10^{-4}$, $<5.6\times10^{-4}$, and
$<7.2\times10^{-4}$ yr$^{-1}$ deg$^{-2}$
