Page "hobbies" Paragraph 205
from
Brown Corpus
The design of a mechanical interlocking frame is much like a mechanical puzzle, but once understood, the principles can be applied to any track and signal arrangement.
In the frame are two sets of bars which interact with each other to prevent the operator from making dangerous moves.
The main set of bars are the `` tappets '' and one tappet is connected to each lever.
If the lever is pulled to clear a signal or move a switch, the tappet moves a short distance lengthwise at the same time.
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