. Bulletin - United States National Museum. Science. lever. The ornamental column forming the stand ol the safety valve is cast iron and does much to de< orate the interior of the cab. I he pipe carrying the escaping steam projects through the cab roof. It is made of copper with a decorative brass band. This entire mechanism was replaced by a modern saferj valve lor use at the (Ihicago Railroad Fail (1949) Fortu- nately, the old valve * preserved and has sin< e been replaced on the engine. rhe steam gauge is a later addition, but could have been put on as early as the 1860's, since ti
. Bulletin - United States National Museum. Science. lever. The ornamental column forming the stand ol the safety valve is cast iron and does much to de< orate the interior of the cab. I he pipe carrying the escaping steam projects through the cab roof. It is made of copper with a decorative brass band. This entire mechanism was replaced by a modern saferj valve lor use at the (Ihicago Railroad Fail (1949) Fortu- nately, the old valve * preserved and has sin< e been replaced on the engine. rhe steam gauge is a later addition, but could have been put on as early as the 1860's, since tin- most \<-_'. according to the eminent 19th-century technical writer and engineer Zerah The two feedwater pumps (fig. 20) arc loci ted be- neath the cab deck (I, fie;. 17). The) are cast-iron construction and are driven by an eccentric on the driving-wheel axle (fig. 27). The airchamber or dome (1, fig. 27) imparts a more stead) How ol the water to the boiler by equalizing the surges of wain from the reciprocating pump plunger. A steam line (3, fig. 18), which heats the pump and prevents freezing in cold weather, is regulated by a valve in the cab (figs. 18, 27). .Vote that the line on the right side of the cab has been disconnected and plugged. The eccentric drive for the pumps is unusual, and the author knows of no other American locomotive so equipped. and Harrison, it is true, favored an eccentric drive for feed pumps. Inn the) mounted the eccentric on the crankpin of the rear driving wheel and thus produced in effect a half- stroke pump. This was not an unusual arrangement, though a small crank was usually employed in place of the eccentric. The full-stroke crosshead pump with which the Jenny Lind (fig. 22) is equipped, was of course the most common style of ivv<.\ pump used in this country in the 19th century. ()f all the mechanisms on a 19th-century locomotive,. 1 /i rah CoLBURN, Recent Practice in Locomotio* Engines (1860), p. 71. Figure 19.
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