What do you find at a crowbar?
Pretty much finished with this years big writing project :-) if it wasn't raining that would mean more time for climbing. Earlier in the year I found the boulder in the photo, bouldering is climbing on small cliffs and boulders. We don't use ropes but use mats to make the landing softer. This is particularly important on very steep boulders as one tends to land on ones back. As you can see this boulder has a very nasty landing so I decided to try to move some of the large stones away from the fall zone.To this end I took with me a steel crowbar and was very impressed with the size of stone I could move with it. As I was carrying it to the site I got interested in the notes that it made every time I hit it on a stone. This seemed to be related to the position of my hand holding it. There was also a very noticeable high frequency ringing that would continue long after the bar was struck even if I tried to damp it down with my hand. Definitely good EE material here. If one of my EE students has got nowhere over the summer I might offer it to them. To illustrate the point I made a video.
Oh, and what do you find at a crowbar? Crows.