. Development and electrical distribution of water power . that could be obtained. The steel pipe, which is about 800feet long, is built of plate varying from |to I inch in thickness, and thoroughlycoated inside and out at the mill with hotasphalt pitch. All connections of plateare made with lapped joints, the cir-cumferential seams being single riveted,while the longitudinal seams are double-riveted. All pipe constructed of f-inchmaterial is stiffened by means of angleirons. The wooden-stave pipe is built on alight descending grade, and it winds inand out along the west bank of the creekthrou
. Development and electrical distribution of water power . that could be obtained. The steel pipe, which is about 800feet long, is built of plate varying from |to I inch in thickness, and thoroughlycoated inside and out at the mill with hotasphalt pitch. All connections of plateare made with lapped joints, the cir-cumferential seams being single riveted,while the longitudinal seams are double-riveted. All pipe constructed of f-inchmaterial is stiffened by means of angleirons. The wooden-stave pipe is built on alight descending grade, and it winds inand out along the west bank of the creekthroughout its entire length. After itsjunction with the steel pipe, the gradebecomes much greater and the pipe con-tinues in a straight line for several hun-dred feet to a standpipe 84 inches in di-ameter and about 200 feet in height,which is built into the supply conduit torelieve any pressure in the line caused byextreme load conditions. This standpipe,which is covered with shingled casing y JO % «H »«qorc 212 DEVELOPMENT AND DISTRIBUTION OF WATER POWER. having a well-shaped cu-pola at the top, is 20 feethigher than the dam. Just after passing thestandpipe, the penstockdescends along the cliff ata sharp angle to a reservoirnear the power-house, 125feet below the top of thebank. The reservoir isanchored on concretefoundations just outsidethe west wall of the power-house. It is provided withfour 48-inch outlets, eachof which delivers water toa turbine wheel under ahead of 266 feet. Theflow of water to each tur-bine is controlled by a 48-inch gate valve, the ar-rangement being such thatanv or all valves can beoperated simultaneouslyby hand, or by power fur-nished by a Pelton water-wheel. The penstocks to theturbines, the pipe line, andreceiver are all equippedwith valves to assist in re-lieving any excess pressurewhich might come onthem, and the main pipeline is provided with a TRENTON FALLS PLANT 213 number of air inlet pipes to allow for the escape or intake of airwhen the line
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