A broad flat groove, say ½in. broad, or as wide as a handsaw file, and 1⁄16in. deep, is cut across the midrib of the gun (Fig. 1), and the edges of this are under cut, either with a sharp-edged file, or, if the operator is expert in the use of tools, with a chisel and mallet. A piece of ivory (Fig. 3), cut so that the grain runs with the length of the barrel, and with an elevated ridge left in the centre, is then fitted tightly in, adjusted as nearly as possible, and the metal clinched down upon it; then the central ridge is filed on either side until, by occasionally firing at a mark, the gun is found to shoot without lateral deviation. It should, in the beginning, be considerably too high, and should then be filed down so as to carry the bullet point blank to its mark at a hundred yards.
If the back sight is lost, cut a notch across the midrib as before, and fashion a piece of iron (Fig. 2) to the same shape as you did your ivory, only let the elevated ridge in this case be across the barrel. File a notch in the centre, and leave the iron a little wider than the rib, so that it may admit of being driven a little to either side, and the superfluous metal filed off when the adjustment is nearly perfected. Mark it, and take it out to do this; then put it in again, clinch it, and test it by firing at a mark.
Figs. 4 and 5 represent the position of the two sights. If the gun shoots to the right, shift the back sight (Fig. 6) to the left and the front sight (Fig. 7) to the right; if to the left, shift the back sight (Fig. 8) to the right, and the front one (Fig. 9) to the left. If the gun shoots too low, file down the front sight; if too high, file down the notch of the back sight.
In one of our own rifles the front sight was, as usual in military patterns, based on the block of iron which forms the check for the bayonet (Fig. 11). We did not remove this, but cut behind it a very shallow groove an inch broad, and in this fixed and soldered a piece of iron with a longitudinal groove, to carry a knife-edged sight of ivory, as seen in Fig. 10.
For night shooting, we used the only sixpence to be found amongst our party; bending and polishing it and clinching it on to a saddle of zinc painted black. Holes were punched in this for leather thongs, and in front was a notch cut to fit the actual sight, and so insure the central position of the silver one when in use (Fig. 13). By day the saddle was turned beneath the barrel (Fig. 12), and the little flat thongs of antelope hide were not at all in the way. With guns not of military pattern the sight could not so conveniently be turned under, but would have to be removed by day; but we should think a broad silver sight might be fixed on a steel spring on the rib behind the sight, with a broad ring to slip over and keep it down by day, as in Fig. 15, or to draw back and let it rise into view by night as in Fig. 14 (p. 201). For the same purpose our late friend, C. J. Andersson, used to wrap a bit of white paper round the muzzle of his gun, pinching it up in the centre, or laying a cord under it to give it a little elevation (Fig. 16).
As a protection, and also for the contrast of the colours, the Dutch, and many of the English colonists, stitch very tightly over all a bit of skin from the inside of the elephant’s ear (Fig. 17). This is very fine, exceedingly strong, and, when rubbed with a little grease, intensely black; it is then very carefully cut, to allow the front sight to appear through, and left to dry. Another advantage of this plan is, that it corrects the errors often caused by the mirage or refraction of the sun’s rays from the polished barrel, which, especially in the tropics, causes the object aimed at to become indistinct, to assume the appearance of motion, and to be seen sometimes considerably above its true position, thereby causing the marksman to miss by shooting over it.
Sheath knives or bayonets.
No wise traveller ever encumbers himself with a long sword or bayonet of ordinary pattern; but every one carries a sheath knife, of from 6in. to 12in. in the blade; and the handle of this ought to be made so that it may fix as a bayonet on his gun. We have seen natives considerably astonished by this sudden conversion of our gun into a spear to kill a wounded animal.