There are essentially two methods of dimensioning features. Firstly, there is the addition of numerical values to dimension lines and secondly, there is the use of symbols. The first type has four elements to it and is the more usual method of dimensioning. This type has been described in Chapter 3 along with the relationship to the ISO rules. The second type uses symbols. In this case, a leader line with an arrowhead touches the feature referred to. Some form of symbol is placed at the other end of the leader line. These two types of dimensioning are described below.
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