Electrical news and engineering . f 20 cubic yards capacity each. The trol-ley wires on this railroad were offset on one side of the trackto allow the dippers of the shovels to pass over the carsfreely when loading them and to permit locomotive cranesto use the tracks. On temporary tracks, alongside thedump, for example, the trolley wires were carried on framedtimber trestles which were mounted on wheels to facilitateremoval when necessary to shift the track. THE ELECTRICAL NEWS 31 For the operatioii (it the electric railway, electric shovelsatid other machinery ami equiimcni. over elec
Electrical news and engineering . f 20 cubic yards capacity each. The trol-ley wires on this railroad were offset on one side of the trackto allow the dippers of the shovels to pass over the carsfreely when loading them and to permit locomotive cranesto use the tracks. On temporary tracks, alongside thedump, for example, the trolley wires were carried on framedtimber trestles which were mounted on wheels to facilitateremoval when necessary to shift the track. THE ELECTRICAL NEWS 31 For the operatioii (it the electric railway, electric shovelsatid other machinery ami equiimcni. over electricalhorsepower were required. In addition to the equipment above noted, other spe-cial machinery and devices were developed, which will hedescribed in detail as this article proceeds. Excavation Methods I In the Welland River section ot the canal, the excava-tion was carried out largely by a cableway excavator andby dredge. The former equipment was a Lidgerwood cable-way of son ft. span on an sn ft. head tower and ilii It. tail. ills of the canal. Two foit comprise the equipment. tower, titted with a o cu. yd. clam. The towers were mount-ed on railroad trucks running on parallel double tracks. Tliecapacity of the plant was such that a trip of the bucket wa?possible every two mhiutes. For the first ft. of theriver a dipper dredge was used, as bridges and other im-pediments interfered with the operation of a cablewayIn the latter part of 1920, when it was decided to makestrenuous etTorts to complete the canal by the end of suction dredge Cyclone, the largest in the world, wastransferred from the harbor development at Toronto to theWelland river, where it assisted in the excavation of boththe river section and the earth section of the excavatedcanal. On account of the tremendous size of the dredge,considerable trouble was experienced in transferring it fromToronto to the Chipawa canal, particularly in navigatingthe Welland river, where bridges, power lines and sha
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