Note chart? this picture shows the notes named both on the bars and under the strings. The instrument looks almost identical to other 'harps of the same vintage, I assume tuning would be be the same.

In that era, the bars were rather loosely placed in between tracks at each end so they did not bind.... the springs have little to do with side to side movement. About all you can do is press straight down, and because you never need to operate two neighboring bars at the same time, it shouldn't make much difference.