. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 152.—Modern Belleville Boiler, with Economiser. BELLEVILLE BOILER. 423 with an oval door clamped in tlie same way as a manhole door. The top ofeach element enters the upper drum with a short internal pipe, and insidethe drum is a series of dash plates, so arranged as to thoroughly separatethe water and the steam. There is further, however, external to the boiler,a separatoi, having an internal spiral dash plate, and, at the bottom, an auto-matic drain. This boiler is a most costly one t
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 152.—Modern Belleville Boiler, with Economiser. BELLEVILLE BOILER. 423 with an oval door clamped in tlie same way as a manhole door. The top ofeach element enters the upper drum with a short internal pipe, and insidethe drum is a series of dash plates, so arranged as to thoroughly separatethe water and the steam. There is further, however, external to the boiler,a separatoi, having an internal spiral dash plate, and, at the bottom, an auto-matic drain. This boiler is a most costly one to manufacture, and even whenmade with an accuracy exceeding that usually followed in engine buildingit loses so much water by the very large number of small leaks as toseriously reduce its efficiency, as well as to require a large reserve offeed water and a constant use of the distillers. After a most lengthy andcarefully made series of experiments with it and the cylindrical boiler, theSpecial Committee appointed by Parliament have condemned its use Navy on these and other grounds, and at
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