ean
armies. The weapon owed its mobility to a rugged, two-wheeled carriage
like a field carriage, but with a relatively short trail that
permitted the wide arc of elevation needed for this weapon.

[Illustration: Figure 34--SPANISH 6-INCH HOWITZER (1759-88). This
bronze piece was founded during the reign of Charles III and bears his
shield. a--Dolphin, or handle, b--Bore, c--Powder chamber.]

English howitzers of the 1750's were of three calibers: 5.8-, 8-, and
10-inch, but the 10-incher was so heavy (some 50 inches long and over
3,500 pounds) that it was quickly discarded. Mueller deplored the
superfluous weight of these pieces and developed 6-, 8-, 10, and
13-inch howitzers in which, by a more calculated distribution of the
metal, he achieved much lighter weapons. Mueller's howitzers survived
in the early 6- to 10-inch pieces of United States artillery and one
fine little 24-pounder of the late eighteenth century happens to be
among the armament of Castillo de San Marcos, along with some early
nineteenth century howitzers. The British, incidentally, were the
first to bring this type gun to Florida. None appeared on the Castillo
inventory until the 1760's.

[Illustration: Figure 35--ENGLISH 8-INCH "HOWITZ" CARRIAGE (1756). The
short trail enabled greater latitude in elevating the howitzer.]

In addition to the very light and therefore easily portable mountain
howitzer used for Indian warfare, United States artillery of 1850
included 12-, 24-, and 32-pounder field, 24-pounder and 8-inch siege
and garrison, and the 10-inch seacoast howitzer. The Navy had a
12-pounder heavy and a 24-pounder, to which were added the 12- and
24-pounder Dahlgren rifled howitzers of the Civil War period. Such
guns were often used in landing operations. The following table gives
some typical ranges:

_Ranges of U. S. Howitzers in the 1860's_

Caliber Elevation Range in yards

10-inch seacoast 5 deg. 1,650
8-inch siege 12 deg.30' 2,280
24-pounder naval 5 deg. 1,270
12-pounder heavy naval 5 deg. 1,085
20-pounder Dahlgren rifled 5 deg. 1,960
12-pounder Dahlgren rifled 5 deg. 1,770

[Illustration: Figure 36--ENGLISH MORTAR ON ELEVATING BED (1740).]

From earliest times the usefulness of the mortar as an