Bridge Inspector's Manual for Movable Bridges

Bridge Inspector's Manual for Movable Bridges

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Using the block control method, the four operating steps of control to open the bridge span will now be discussed. ... The traffic light controller must be connected electrically to the operatora#39;s switch so that when the bridge tender operates the warning light switch, a switch contact ... 6-2 shows the traffic control block diagram.

Title:Bridge Inspector's Manual for Movable Bridges
Publisher: - 1977

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