O

Controlling line

1400, 20SQ

Running dimensions. Use should be restricted to surveys so

Small dimensions are best indicated thus

Modular dimension

Leader lines, indicating where notes or descriptions apply

Centre lines or grid lines.

Drawn in thin line to distinguish them from service runs. (See Appendix 1)

Dotted line indicates important lines hidden in the particular plan or section view taken. (Also, on demolition drawings, work to be removed)

Break line

Section line. The arrows point in the direction of view and the line joining them indicates the plane of the section

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