. Electric railway journal . Kectric Ry. Journal Power Station Improvements in Boston—Plan of Recon-structed Charlestown Station of the B. F. Sturtevant heavy pattern, tested to pressure. The primary heaters between theengines and condensers are of the horizontal, closed type,and are designed to raise the feed water from 40 deg. within 5 deg. of the temperature of the exhaust open heater is of the Cochrane horizontal, cylindricaltype, with cast-iron trays, and raises the temperature of. Power Station Improvements in Boston—Exterior ofCharlestown Station the
. Electric railway journal . Kectric Ry. Journal Power Station Improvements in Boston—Plan of Recon-structed Charlestown Station of the B. F. Sturtevant heavy pattern, tested to pressure. The primary heaters between theengines and condensers are of the horizontal, closed type,and are designed to raise the feed water from 40 deg. within 5 deg. of the temperature of the exhaust open heater is of the Cochrane horizontal, cylindricaltype, with cast-iron trays, and raises the temperature of. Power Station Improvements in Boston—Exterior ofCharlestown Station the feed water to within 3 deg. of the temperature of theexhaust from the auxiliaries. The economizers deliverthe water to the boilers at a final temperature of about250 deg. Fahr. Squires automatic feed-water regulators have been sup-plied in all the stations, on old boilers as well as device controls the feed valve through pressure ex- erted on a diaphragm which tends to close the valve whenthe water in the boiler rises above a predetermined pilot valve actuated by the expansion of a metal harplocated in the side of the boiler regulates the pressure onthe diaphragm. The harp is placed at the proper height inrespect to the water level to give the maximum expan-sion or contraction for any change in the height of thewater. The action of this automatic device is safeguardedby a water-column alarm which will attract the firemansattention and enable him to regulate the water supply bya hand-operated val
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