As I've been working on a puppet-building module for my course, it's caused me to collect some screen-grabs for the history of stop-motion puppets.
This is one frame of the Kinex Short Crossing the Alps, where the animator’s arm was accidentally captured on film! Who is this mystery person? Perhaps it could be Orville Goldner, who worked at the studio and years later worked on King Kong. The world may never know for sure, as there is little known documentation on the mysterious Kinex Films.
I've uploaded a bunch more stop-motion history stills here.