a. Select three masts of approximately equal
size and place a mark near the top of each mast to
indicate the center of the lashing.
b. Lay two of the masts parallel with their tops
resting on a skid or block and a third mast between the
first two, with the butt in the opposite direction and the
lashing marks on all three in line. The spacing between
masts should be about one half or the diameter of the
spars. Leave the space between the spars so that the
lashing will not be drawn too tight when the tripod is
c. With a 1-inch rope, make a clove hitch
around one of the outside masts about 4 inches above
the lashing mark, and take eight turns of the line around
the three masts (fig. 6-53). Be sure to maintain the space
between the masts while making the turns.
d. Finish the lashing by taking two close
frapping turns around the lashing between each pair of
masts. Secure the end of the rope with a clove hitch on
the center mast just above the lashing. Frapping turns
should not be drawn too tight.
a. An alternate procedure (fig. 6-54) can be
used when slender poles not more than 20 feet long are
being used or when some means other than hand power
is available for erection.
b. Lay the three masts parallel to each other
with an interval between them slightly greater than
Figure 6-53.Lashing for a tripod.
Figure 6-54.Alternate lashing for a tripod.
twice the diameter of the rope to be used. Rest the tops
of the poles on a skid so that the ends project over the
skid approximately 2 feet and the butts of the three
masts are in line.
c. Put a clove hitch on one outside leg at the
bottom of the position the lashing will occupy, which
should be approximately 2 feet from the end. Weave the
line over the middle leg, under and around the outer leg,
under the middle leg, over and around the first leg, and
continue this weaving for eight turns. Finish with a
clove hitch on the outer leg.
2. Erecting. The legs of a tripod in its final position
should be spread so that each leg is equidistant (fig.
6-55) from the others. This spread should not be less
than one half nor more than two thirds of the length of
the legs. Chain, rope, or boards should be used to hold
the legs in this position. A leading block for the fall line
of the tackle can be lashed to one of the legs. The
procedure is as follows:
a. Raise the tops of the masts about 4 feet,
keeping the base of the legs on the ground.
b. Cross the two outer legs. The third or center
leg then rests on top of the cross. With the legs in this
position, pass a sling over the cross so that it passes over
the top or center leg and around the other two.
c. Hook the upper block of a tackle to the sling
and mouse the hook.
d. Continue raising the tripod by pushing in on
the legs as they are lifted at the center. Eight men should
be able to raise an ordinary tripod into position.
e. When the tripod legs are in their final
position, place a rope or chain lashing between the legs
to hold them from shifting.
3. Erecting Large Tripods. For larger tripod
installations it maybe necessary to erect a small gin pole
to raise the tripod into position. Tripods, lashed with the