โ Scribed by Wm. Griffith
No coin nor oath required. For personal study only.
water can be entirely dispensed with, and the summit level can be utilized for storage, its banks being high enough to contain the highest and its bottom low enough to give the desired draft at the lowest water, the variation being taken up at the lock. In most canals the heavy tonnage is one way, and down hill. In such cases the descending,tonnage will not only operate the lock, but also lift water to the summit level.
It will be seen that the first cost of canals and their demands on the water-supply arc reduced to a minimum. Application of steel to the locks reduces their cost of installation, operation and maintenance as greatly as it has reduced such costs in other engineering structures. The State authorities estimate that the saving in wages at Lockport will exceed intei'est on the entire cost, and at Cohoes such saving will be double the interest on the cost of installation, so that buildir/g the Cohoes locks will save an actual profit. In ship canal locks the saving will be in ratio increasing with their size.
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