Miss Prism

The trouble was due to the large lap and increased travel of valve. It had come about through the increased throw and the angularity of the quadrant link. In the Walschaert gear the more lap obtained, the more work the combining lever had to do, and only a small percentage of the work was taken by the quadrant. In that particular case the angularity of the link was rather excessive, and it would be an advantage to decrease the angularity of the link and increase the angularity of the radius r...