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Optical timing observations of the Crab pulsar 1968-1979
Observations of the Crab pulsar, which were made at the 60 cm refractorof Hamburg Observatory, are discussed. The data acquisition system usedin the observations is based on a PDP-8 minicomputer. The system hadbeen designed for a scanning double star photometer. Attention is givento details of data acquisition procedures, instrumentation, datareduction, phase and frequency residual diagrams, the glitch in early1975, a number of smaller glitches, frequency noise, and jumps in thefrequency derivative. It is pointed out that even in the short span ofone percent of its lifetime, the Crab pulsar has displayed severalcompletely unpredicted activities, which may well be the clue to theunderstanding of neutron star structure.
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