THE TORONTO-BARRIE TOLL CABLE 595 



buried at the road intersections. During the late summer and the 

 autumn, when the swamp had dried out, a 60-foot right-of-way was 

 cleared. As the soil was still moist and soft, the brush and small trees 

 were uprooted by a tractor, a method of clearing which proved quick 

 and economical. The swamp fixtures were placed before the ground 

 froze, and the cable during the winter. 



Pole Line 



The cable was erected on the existing pole line between Toronto and 

 Aurora. The size of the cable erected on 10 M. strand permitted the 

 removal of every other pole in the old line, with a resultant 185-foot 

 average spacing. As is shown in Fig. 4, where it was necessary to 

 change an existing pole, a new pole was placed and fastened to the old 

 pole by means of stub reinforcing bands, thus eliminating the expense 

 of transferring the open wire. Upon the release of the open wire by 

 transfer of circuits to the cable, the wire and old poles were removed. 



The new section of pole line was erected on a 200-foot spacing, with 

 occasional spans up to 250 feet, as shown in Fig. 5. This increased 

 pole spacing was also expected to reduce ring cutting and bowing. 



Construction Details and Tests 



At a number of points open wire loops connected directly to the 

 cable. At these junctions there were installed open space protectors 

 having a lower breakdown than the cable pairs, and connected between 

 the open wires and the cable sheath ; also a few spans from the junction, 

 1000-volt protectors were connected between the open wires and driven 

 grounds. This arrangement was more economical than the use of 

 protection cable. The cable has gone through two complete lightning 

 seasons without any failures or even permanent protector operations 

 due to lightning. 



In so far as manufacturing and storage facilities permitted, the 

 reel lengths of the cable were assigned to their locations on the basis 

 of obtaining as close an average loading section capacitance to the 

 nominal value of 0.085 mfd per mile as was feasible. All reel lengths 

 for the aerial sections were manufactured 1508 feet long, this length 

 being sufficient to permit the assignment of a reel at any point in the 

 line. Particular care was taken in this respect towards the ends of 

 the cable where departures from the average would have the greatest 

 effect on the return loss. To ensure proper assignment of reels, a 

 route map was made up to scale with the manufacturer's reel number 

 shown in its proper location. 



