4. The Caution Signal, to slacken speed, is shown by the Semaphore Arm on the Left-Hand Side being raised to an angle of 45 Degrees, thus:—
5. The Danger Signal, always to stop, is shown by the Arm being raised to the Horizontal position, thus:—
When the two Arms are raised both Lines are blocked.
6. The Arm and the Lamp are both worked with the same hand lever, and at the same time.
7. The All Right Signal is shown by the white Light.
8. The Caution Signal by the green Light.
9. The Danger Signal by the red Light.