Scale and rotate along a path
I'm trying to recreate the following lines in photoshop but I'm not sure I'm searching for the right keywords.

I've found tutorials for stroking along a path but I can't seem to get the brush to rotate as it goes along the path so the icile tips are either converging or diverging as you move along the path. Likewise, I've found tutorials for scaling along a path but they are always either increasing or decreasing. I can't figure out how to make it vary along the path. I'm looking for someone to point me the right direction please.
