porcupine boiler[′pȯr·kyə‚pīn ¦bȯil·ər]
A boiler having dead end tubes projecting from a vertical shell.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A vertical, cylindrical boiler having many short dead-end tubes projecting from the cylindrical surface to provide additional heating surface.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.