Roger Eichhorn <eichhorn@xxxxxx> writes: > There are a lot of photos on the web of atomic explosions taken with > Edgerton's "mechanical shutter" camera, and even photos of the device > itself. But, I can't find any web sites that state exactly what kind > of shutter it was. One mechanism that was used in the early atomic era for very short exposures was a sheet of glass and an explosive charge; powdered glass is *much* less transmissive than solid glass :-). I think this was sometimes used as a capping mechanism on top of other very VERY fast mechanisms that weren't completely opaque. -- David Dyer-Bennet, <mailto:dd-b@xxxxxxxx>, <http://www.dd-b.net/dd-b/> RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/> Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/> Dragaera/Steven Brust: <http://dragaera.info/>
