A commonly used drafting and map drawing conventional symbol for falls and rapids.
French, Thomas E A Manual of Engineering Drawing for Students and Draftsmen (New York, NY: McGraw-Hill, 1911)
2400×814, 224.8 KiB
1024×347, 42.6 KiB
640×217, 24.9 KiB
320×108, 10.3 KiB