CAP AND PLATE, THIRD ARTILLERY, 1821 _USNM 66603-M. Figure 31._ [Illustration: FIGURE 31] Although several "yellow" eagles that can be attributed to the 1821-1832 period are known, this brass specimen on the bell-crowned cap is the only one known to the authors that has the prescribed regimental number cut out of the shield. The button on the pompon rosette--which appears to be definitely original to the cap, as does the eagle--carries the artillery "A," thus the assignment to that branch of the service. The eagle bears a close similarity to the eagles on the 1812 and 1814 infantry cap plates and the 1807 Marine Corps cap plate, and is possibly the work of the same designer. CAP INSIGNIA, INFANTRY, 1822 _USNM 60364-M (SK-120). Figure 32._ [Illustration: FIGURE 32] Early in 1822, the Secretary of War, acting on a suggestion of Callendar Irvine, ordered that all metal equipment of the infantry be of "white metal" in keeping with its pompons, tassels, and lace.[73] This specimen, struck in copper and silvered, is believed to have been issued as a result of that order. [Footnote 73: Letter dated January 4, 1822, from Secretary of War to Irvine (Records AGO).] ¶ The 1821 regulations stated that cockade eagles should measure 1-1/2 inches between wing tips. In 1832 this wingspread was increased to 2-1/2 inches. Thus, specimens of a relatively uniform pattern and measuring approximately 1-1/2 inches in wingspread will be considered as of the Regular Army, 1821-1832. Similarly, those of a relatively uniform pattern and measuring approximately 2-1/2 inches in wingspread are dated 1832-1851. COCKADE EAGLE, C. 1821 _USNM 60371-M (S-K 127). Figure 33._ [Illustration: FIGURE 33] This eagle, struck in brass, has wings extended, head to the right, federal shield on breast with no stars, olive branch in right talon, and three arrows in left talon. COCKADE EAGLE, INFANTRY, C. 1821 _USNM 60372-M (S-K 128). Not illustrated._ This eagle is struck from the same die as the preceding specimen, but it is in white metal rather than brass. COCKADE EAGLE, C. 1821 _USNM 60367-M (S-K 123). Figure 34._ [Illustration: FIGURE 34] Of silver on copper, this eagle is similar to the two preceding specimens, but is struck from a variant die. It possibly was worn by the Militia. COCKADE EAGLE, INFANTRY, C. 1821 _USNM 60373-M (S-K 130). Figure 35._ [Illustration: FIGURE 35] This specimen is very similar to those above, but it has 13 stars in the shield on the eagle's breast.