Pöörates alidaadi limbil, saab välja lugeda iga määratava suuna horisontaalnurga. Selline alidaadil ja limbil põhinevmehaaniline süsteem on aluseks enamikule nurgamõõduinstrumentidele.
That half of the limb having the lesser angular elevation above the horizon is called the lower limb; that half having the greater angular elevation is called the upper limb.
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