Palomar high-redshift quasar surveys

I use the name Palomar high-redshift quasar surveys for a series of surveys outlined in a series of 1980s-1990s papers with titles beginning "Spectroscopic CCD Surveys for Quasars at Large Redshift". The surveys were to find such quasars using the Hale Telescope with at-the-time leading-edge technology, e.g., incorporating CCDs. Various instrument combinations were used for the individual surveys. The surveys shared the designator prefix, PC. (Explanations of the abbreviation are PC rare and inconsistent: I've seen "Palomar confirmed" and "Palomar calibrated".) Survey names as per the published paper titles:

• "A deep PFUEI survey".
• "A PFUEI transit survey".
• "The Palomar transit grism survey" (PTGS).
• "The Palomar Scan Grism Survey" (PSGS).

PFUEI (for "Prime Focus Universal Extragalactic Instrument") was a Hale telescope instrument at the time. The phrase "transit survey" was used differently than more recent usage: currently the phrase suggests a search for extra-solar planet transits, but in this early case, the "transit" meaning was a source passing through the field of view (i.e., like a drift scan), a method used to discover quasar candidates.