Figure 3-11.Typical fixed, self-contained alignment sights.
TRAM BARS AND TRAM BLOCKS
Tram bars are used to set an element to an exact
position, to determine the distance between two tram
blocks that are fastened to the element. One block is
fastened to the rotating structure of the element, and
the other block is fastened to the fixed structure of the
element. As shown in figure 3-12, the tram bar is used
to ensure the correct positioning of the movable
Figure 3-12.Tram bar and tram blocks.