Our filter was located nearly 20 feet from the end of the river, and in order to get a good current of water to revolve our wheel we had to place it about 15 feet from shore. This necessitated building a trough line 35 feet long. Ten feet of this line were already provided in the top of the tall tower. This tower was now set up in place with the legs firmly wedged into holes excavated in the bottom of the river. The legs on the shore side were sunk a little deeper, so as to tilt the trough slightly shoreward. The outer end of the trough was about 12 feet above the level of the water. We needed but one more tower to support the remainder of the trough line. This tower was built like the first one, but was much shorter, as it was erected on land and the level of the trough at the top had to be 5 or 6 inches lower so as to make the water flow. We connected the towers by another V-shaped trough section. This we nailed to the under side of the first trough and to the inside of the second trough. The latter was then in the same way connected by a trough section with the upper filter barrel. We now rigged up our shorter tower about a foot from the taller one, wedging in the legs so that the top came level with the slotted boards of the other tower.