Two fast-rotating pulsars have been discovered at high Galactic latitudes in the course of a systematic survey with the Arecibo telescope. PSR J2235 + 1506 has a period of 59.7 ms, a small magnetic field, and a spindown time scale in excess of 10 exp 9 yr. It is only the third such object known (outside of globular clusters) which is not a member of a binary system. PSR J2317 + 1439 is a 3.4 ms pulsar in a 2.46-d orbit with an approximately 0.2 solar mass companion. Its orbital eccentricity e = (1.2 +/- 0.8) x 10 exp -6 is, to our knowledge, the smallest known for an orbiting object of any kind. We briefly discuss some characteristics of the rapidly growing sample of 'field' millisecond pulsars.
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Camilo et al. (1993) studied this question.