| http://www.w3.org/ns/prov#value | - Positive pulses each having an area proportional to the sine ??e are fed to the integrator for n cycles where n is an integer counted by the microprocessor and selected so that after n cycles the output of the integrator unit 17 has risen by a suitably high voltage e.g. 1 V. Due to the changes in the horizontal component of the earth's magnetic field with latitude, it is desirable that n may be va
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