Figure 16.—The “Pioneer” as first exhibited in the Arts and Industries building of the Smithsonian Institution prior to restoration of the sandbox. (Smithsonian photo 48069D.)
[BOILER continued]
The steam dome ([fig. 18]) is located directly over the firebox, inside the cab. It is lagged and jacketed in an identical manner to the boiler. The shell of the dome is of 5/16-inch wrought iron, the top cap is a cast-iron plate which also serves as a manhole cover offering access to the boiler’s interior for inspection and repair.
[Figure 17.]—“Pioneer” locomotive. (Drawing by J. H. White.)
![[Figure 17.]](#1240101807841254197_i2564217_lrg.png.id-3762885204108586807.wrap-0.html.html){kind=link}