In the transportation of lattice-work towers or masts care must be taken not
to bend or damage the diagonals or stays. Square lattice masts intended as
intermediate or supporting masts only, and therefore of light cross-section,
require special care. The ends must not be left free to swing about, as this would
easily cause damage to the light angle iron stays.
Wooden poles of ordinary length can be carried to the erection spot by the
erecting gang, consisting in this case of four or five men. Iron masts are usually
carried on a two-wheel trolley, which should have broad-rimmed wheels, as it
will often be used on bad field paths or agricultural land.
The raising of iron masts is carried out by means of ladders or by lifting
struts — i.e., two poles coupled together near the top with rope (see Fig. 204).
i
Fig. 203.
OVEKHEAD TRANSMISSION LINES



199




Fia. 20-t.
