Excerpt from Forged Steel Water-Tube Marine Boilers
The great point of difference in the several types of water-tube boilers now on the market, lies in the character of the tubes used. These are either simple straight tubes, simple bent tubes or compound straight tubes, the latter being constructed with a smaller tube inside of each main tube for the purpose of promoting circulation, one end of each main tube being closed.
The bent-tube type comprises a great variety of designs, the tubes being either actually bent to certain sinuous forms, or by use of elbows or return bends in connection with short sections of straight tubing.
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