496
EXPOSITION AT VIENNA.
resented in Plate II. A lever is added to those already in
Plate III.
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the signal-cabin, called the " switch-lock lever,” from which motion is communicated to a fastening bolt, F, as is shown in the drawing. This bolt slides in a stationary guide, and, when the switch is properly placed, fits into holes in the flattened portion of one of the switch stay-rods. A comparison of the plan, and the section upon the line C D, will serve to