Multiple reference lines

Most symbols carry one reference line. When a joint needs several operations performed in a defined order, the drawing can stack additional lines above the first, all sharing the same leader and arrow. Each line holds a complete instruction of its own, with its own weld symbols, dimensions, supplementaries, and tail.

Order is read outward from the arrow. The line closest to the arrow is the first operation, the next line out is the second, and so on. That is the one thing multiple reference lines add that a single line cannot express: a single line says what to do but never in what order, while stacked lines say exactly that.

The arrangement earns its complexity on joints where a step in the middle changes what follows — gouge the root, then weld, then examine, then dress. Each of those can occupy its own line, with a note or process reference in its own tail, so the whole sequence sits on one symbol instead of being scattered across a page of notes.

The rest of the notation carries over unchanged. Each line has its own arrow side and other side, its own elbow supplementaries, and its own tail, and the shared arrow means every line refers to the same joint. Read them one at a time from the arrow outward rather than trying to take the whole stack in at once, and the arrangement stops looking intimidating.