Fig. 21 shows the closed top of the powder-magazine, with a valve or turn cover, _e_, which closes a hole through which the magazine is to be filled. This magazine occupies the space from _f_ to _g_, Fig. 19, where the powder is contained in bulk. The space from _g_ to _h_ is a receptacle which is divided by partitions into separate chambers, the same in number with the tubes _d d_, each of which chambers contains the quantity of powder required for the charge of a single chamber, _i i_ is the rim of this chambered receptacle, which is capable of being turned round to a short distance by the thumb and finger for the purpose of charging the chambers with powder. This turning round brings openings _u u_, Fig. 20, in the lower end of the chambered box to coincide with the openings in the tubes _d d_, so that the powder contained in the chambers in _i i_ may pass out therefrom into the chambers of the receiver. There are openings also in the upper plate or top of the receptacle _i i_ corresponding with openings in the bottom of the magazine _a_, which are closed by turning the rim _i i_, so as to prevent powder from falling through from the magazine while the receiver is being filled. Fig. 27 is a section through the middle of the chambered receptacle _i i_, the circles _r r_ representing the chambers for containing the powder. _s s_ are the openings in the top plate of these chambers, through which the powder is admitted into them from the magazine _a_. The dotted lines _t t_ show the plan of the openings in the bottom plate of the chamber _a_, the chambered receiver being shown in the position in which those openings are covered. In Fig. 28 the same parts are represented; but the chambered receiver is supposed to be turned round or standing in its ordinary position, so that the openings S S and _t t_ coincide. The chambered receptacle is restored to its place by means of a spring of any suitable form. The whole operation of this part will be more clearly made known by the sectional representation of the magazine for balls, which I am now about to describe.