The quadrants are referred to as the left lower quadrant, left upper quadrant, right upper quadrant and right lower quadrant, as follows below.
22.
These worked in the upper quadrant to distinguish them from the two-position lower quadrant semaphores that were standard at the time of their introduction.
23.
From the 1920s, upper quadrants began to replace lower quadrant signals, that is apart from on the GWR, which stuck with its lower quadrants.
24.
From the 1920s, upper quadrants began to replace lower quadrant signals, that is apart from on the GWR, which stuck with its lower quadrants.
25.
After the war, in 1948, the college established'Tom Town'on the eastern end of the lower quadrant, which is currently home to the O'Shaughnessey-Frey Library.
26.
It has three, equidistant notches placed on each of the fine crosshair, and there are thick bars in the left, right and lower quadrants.
27.
Built in 1920 in Swissvale, Pennsylvania, this style B lower quadrant semaphore was originally located in Nephi, Utah along the Union Pacific Railroad line.
28.
During the 1870s, all the British railway companies standardised on the use of semaphore signals, which were then invariably all of the lower quadrant type.
29.
During the 1870s, almost all the British railway companies standardised on the use of semaphore signals, which were then invariably of the lower quadrant type.
30.
If pain is felt in the right lower quadrant, then there may be an inflamed organ or piece of tissue in the right lower quadrant.
