No. 14 is a sketch of the mountain-train pattern, which has remained unaltered up to the present day, excepting some changes introduced by Major Backhouse in the mountain-train of the late Shah Sujah, but which have not been made generally known. Some changes are now probable, as a mountain-train 12–pounder howitzer has been substituted for the old 4⅖-inch howitzer. This new piece weighs 3 cwt., and its lines are drawn on the principles of the 12–pounder howitzer; the charge is 12 oz. of powder (an increase of 4 oz.), which, with the increased length, makes it a much more effective piece. The siege-carriages underwent little change during this time. From their solid nature they have been always less liable to injury than field-carriages; and, consequently, attention has been less forced to them by the repairs of daily accidents; less temptation has therefore offered to introduce improvements and alterations, and the pattern established in 1801 remained in use till 1823; indeed, at the present time there are many carriages of that kind in magazines. In 1823 a new pattern siege-carriage (No. 15) was introduced; not, however, differing essentially from the old one; uniformity in axles, beds, limbers, &c., and improvements in minutiæ, were the chief alterations. A new kind of carriage was also introduced at this time for the iron howitzers, which superseded the brass 8–inch as a siege-piece; the trail was much shorter than that of siege-carriages, and furnished with small truck-wheels, to ease the recoil. [Plate No. 16.] Iron mortars and mortar-beds also superseded the brass mortars of 8–inch and upwards, and their wooden beds. No alteration has been made in any of these articles. In 1823, a general reform in the ordnance equipment in Bengal took place, and, with the changes above noted, the block trail pattern was introduced for the light field-carriages. The ammunition-carriage was made with a limber exactly similar to that of the gun, and the ammunition was divided into six boxes, two on the limber, and four on the body of the carriage, easily removable; the wheels, axles, and beds were made similar, and pains were taken to render all parts as uniform as possible, so that one set might answer for the repairs of all. On their first introduction into Bengal, in the attempts to lighten the carriages as much as possible, some were made too weak, especially those for the 24–pounder howitzers, and slight alterations were made from time to time to obviate this defect.