_USNM 61618. Figure 49._
[Illustration: FIGURE 49]
The 1851 uniform regulations called for a "castle of yellow metal one
and five-eighths inches by one and one-fourth inches high" on both the
coat collar and the hat of "Engineer Soldiers." This specimen, struck
in brass, conforms exactly to the descriptions and drawing in the
Horstmann publication of the regulations.