I always imagined the Junior being smaller than it actually is. Only in it's case you can notice the difference in size compared to the Blickensderfer. The main difference is that the Junior is flatter. In the video, I took the machine apart, so you can see what happens when you hit a key.
In 1910, the Junior was replaced by the Bennett. This new machine had a paper table, and the small ink rollers were replaced with a ribbon. It didn't matter much; the Blickensderfer was far more popular and sold over 190.000 machines between 1893 and 1917, while Junior/Bennett didn't sell more than 40.000 machines.