Testing and adjustment of Fundamental relations |
An instrument is said to in permanent adjustment if it satisfies all the relations among its fundamental lines. The permanent adjustment of an instrument usually gets disturbed after long or prolonged use. So, the state of relationship among different fundamental lines should be checked occasionally and corrections are required to be done, if necessary. The operations are based on the geometry of the fundamental line and thus, may get upset one relation while rectifying other. In order to avoid such possibility, the permanent adjustment should be made in the order.
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