On the Rockets leaving the frame, No. 1 immediately runs up and spunges out the two chambers with a very wet spunge, having for this purpose a water bucket suspended at the top of the frame; which being done, he receives a Rocket from No. 2, as before, No. 3 having, in the mean time, brought up a fresh supply; in doing which, however, he must never bring from the rear more than are wanted for each round. In this routine, any number of rounds is tired, until the words “_Cease firing_” are given; which, if followed by those, “_Prepare to retreat_,” Nos. 3 and 4 run forward to the ladder; and on the words _“Lower frame_,” they ease it down in the same order in which it was raised, take it to pieces, and may thus retire in less than five minutes: or if the object of ceasing to fire is merely a change of position to no great distance, the four men may with ease carry the frame, without taking it to pieces, the waggon following them with the ammunition, or the ammunition being borne by men, as circumstances may render expedient. _The ammunition_ projected from this frame consists of 32-pounder Rockets, armed with carcasses of the following sorts and ranges:-- 1st.--_The small carcass_, containing 8 lbs. of carcass composition, being 3 lbs. more than the present 10-inch spherical carcass.--Range 3,000 yards. 2nd.--_The medium carcass_, containing 12 lbs. of carcass composition, being equal to the present 13-inch.--Range 2,500 yards. 3rd.--_The large carcass_, containing 18 lbs. of carcass composition, being 6 lbs. more than the present 13-inch spherical carcass.--Range 2,000 yards. Or 32-pounder Rockets, armed with bursting cones, made of stout iron, filled with powder, to be exploded by fuzes, and to be used to produce the explosive effects of shells, where such effect is preferred to the conflagration of the carcass. These cones contain as follows:-- _Small._--Five lbs. of powder, equal to the bursting powder of a 10-inch shell.--Range 3,000 yards. _Medium._--Eight lbs. of powder, equal to the bursting powder of a 13-inch shell.--Range 2,500 yards. _Large._--Twelve lbs. of powder.--Range 2,000 yards. N.B. I have lately had a successful experiment, with bombarding Rockets, six inches diameter, and weighing 148 lbs.--and doubt not of extending the bombarding powers of the system much further. [Illustration: _Plate 6_  Fig. 1  Fig. 2] THE MODE OF USING ROCKETS IN BOMBARDMENT, FROM EARTH WORKS, WITHOUT APPARATUS. Plate 7, Fig. 1, is a perspective view of a Battery, erected expressly for throwing Rockets in bombardment, where the interior slope has the angle of projection required, and is equal to the length of the Rocket and stick.