10 BULLETIN 1232, U. S. DEPARTMENT OF AGRICULTURE. 
tacked. This cable carried two spare wires (neutrals), not used. 
This was in the crossover wells, i. e., away below the floor of the 
lock chamber. In this case the cables have a certain definite twist 
and the termites followed the two spare, unused wires, and kept 
entirely away from the wires carrying the high-tension current. 
It is the writers' opinion that much more damage was done, but 
that it was sporadic in nature, so that it was entered in the records 
only as repair work, of which there is always plenty. 
The damage was confined particularly to one small section along 
the center wall of these locks, between two or three of the light 
posts. The duplex cable, which measures 9 "by 19 milli meters on 
cross section, runs through conduit pipes that are 3^ inches in 
diameter (PL V, A),. The particular type of injury is well illus- 
trated in the photographs (PL V, B-G). As a rule, the termites had 
their galleries attached to the lead-covered cables. At places, for 
some reason or other, they worked into the lead, perforated it, and 
then traveled between the two insulated wires (PL V, Z>), there 
being some space between these wires. As this space is not wide 
enough, they chewed away the insulating material, including the 
rubber (PL V, D, E) . The hole through the lead is usually en- 
larged on the inner surface. They travel thus between these two 
wires for spaces of a foot or so, sometimes only for a few inches, and 
then emerge again and build the galleries along the outside of the 
lead cable. It is estimated that there was a hole every foot or so 
(PL V, B, C, G). The particular damage to the service is due to 
the entrance of moisture through these holes. 
In another instance these termites cleaned off on the duplex cable 
a section about 15 inches in length along the narrow edge, thus giving 
the cable a flat surface and making it look very much as if it had gone 
through a shaper machine, excepting that the surface was not very 
smooth* (PL V, E.) 
The center wall of the locks consists of a main tunnel near the sur- 
face, extending only as far as there are lock gates. Since the center 
wall is prolonged farther than the two side walls, the outer part has 
no tunnel, but only manholes, some of these large recesses being big 
enough for a man to walk around in. Each manhole feeds two lamp- 
posts. It was at one of these that most of this damage was noted. 
It was found that in these manholes and recesses plenty of moisture 
was usually present, and in most instances some of the timber was 
Description of Plati: V. 
[NJTJRY TO IjDAD-COVBBED CABLE) BY THK TERMITE Coptntmnrs nir/rr AT M*I lUlT/ORFS 
Locks, C. Z. : I. View In one of larger manholes, in center wall of Locks, showing ends of 
3 £ -in en conduit pipes and duplex lead-covered cable coming out of these. Across second 
(middle) pipe is scon a termite gallery which started in the pipe above and is completely 
separated from the wall. Belowmiddle pipe is seen continuation of it, about one-half inch 
suspended. Wandering galleries along concrete wall coalesce in places or become enlarged, 
forming small cavities in which termites congregate. Flashlight photograph by E St. 
Clair Clayton, November, 1921. /?. Fourtypical samples, in one case Is seen a large area 
chewed away with part of insulation also gone. These are duplex telephone 7-Btrand ca- 
bles. Holes occurred aboul every fool or so, th< termites getting between the tM 
wires and traveling in this space, eating awaj part of insulation. Duplex cable meas- 
ures IP by 9 millimeters, r. Five pieces of duplex lead-covered telephone cable, showing 
holes made through lead sheathing by termites. D, Pari of cable covering opened out 
in show runway of termites between two insulated wires, parts of insulation eaten away 
:■> rubber coverings and sometimes even this eaten away. /:. Pari of lead covering chewed 
also portion <>f Insulation. In the second case termites clewed away a flat channel. 
aboul I- inches long, along edge of lead cable. /'. Another view of /;. showing eaten- 
away Insulation running whole length of wire in both cases and in one with more er- 
bended Inju "," opening. Q, View of /> and /•'. with only a portion of had cover- 
ing laid open, showing boring a- Qrs1 discovered. 
