We are measuring the phase of optical pulses from NP 0532 against an atomic time standard. The first 6 weeks of observation give the pulsar frequency v and its time derivatives vt (= dv/dt), and v, g~ in agreement with earlier measurements, but with improved accuracy. We find (P,gg P/Pt2) = 4.76 ± 0.65. This preliminary result is consistent with angular-momentum loss by gravitational radiation
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Boynton et al. (1969) studied this question.