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We present a description of the Prototype All-Sky Imager (PASI), a backendcorrelator and imager of the first station of the Long Wavelength Array (LWA1).PASI cross-correlates a live stream of 260 dual-polarization dipole antennas ofthe LWA1, creates all-sky images, and uploads them to the LWA-TV website innear real-time. PASI has recorded over 13,000 hours of all-sky images atfrequencies between 10 and 88 MHz creating opportunities for new research anddiscoveries. We also report rate density and pulse energy density limits ontransients at 38, 52, and 74 MHz, for pulse widths of 5 s. We limit transientsat 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 haverate densities $<1.2\times10^{-4}$, $<5.6\times10^{-4}$, and$<7.2\times10^{-4}$ yr$^{-1}$ deg$^{-2}$

Monitoring the Sky with the Prototype All-Sky Imager on the LWA1