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Updated: June 19, 2025
When the parts are in this position, the suspension-rod, S, the arm, G, and the lever, M, will be as one piece, and their motions will be identical, consisting simply of vibration about the axis of the rock-shaft, O. The motion of the lever, M, is then due solely to the pin, B, which is in this case exactly in line with the journal, J, so that the result is the same as though this eccentric rod were connected directly to the lever; and the pin, P, being also in line with B and J, and kept so by the suspension-rod, S, it will be seen that the bridle-rod, R, will move with the link, L, as though the two were rigidly fastened together.
As I turned to enter the cab the roar of the coming express came down the wind on the frosty air and my eyes fell on the rail ahead. My God, they were full to the siding! It was a stub-rail switch, and the stand had moved the target and the light, but not the rails the bridle-rod was broken. I yelled like a mad man, but the brakeman had gone to the caboose for his lunch pail. I ran to the switch.
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