The semi-circle of life: new protractors go up and old protractors come down. I found four ghosts around town, including the one above. I also found three previously unnoticed protractors: No. 44, No. 217 and No. 265. Finally, a new high: No. 314 in Garfield.
I haven’t tracked down all the tips people have been sending in, but I hope to soon.
The updated Master List. And the visuals: