Water Wheels for Niagara. Three of the immense turbine water wheels, with their auxiliary mechanism, built in Philadelphia for the concern that proposes to utilize the stupendous power of Niagara Falls for industrial purposes, have been finished. They are being boxed up preparatory to shipment, and will be put in place in a short time. Each turbine was built at a cost of about $200,000, and each is expected to develop 5000 horse-power. The experiment of harnessing Niagara Falls, and making it do the work of steam, is looked forward to by engineers all over the world ; for, if the experiment is successful, it will be one of the great achievements of the century. The plant is to be put in some distance above the falls. The turbine itself is a small part of the mechanism. It is only six feet six inches in diameter, with two faces, each…