During the North Australian Expedition, when Mr. Gregory was preparing for the journey from the Victoria River to the Albert, in the Gulf of Carpentaria, he collected all the emptied preserved meat tins, and burning off the old paint by placing them above the forge fire, smoothed down the tin upon the surface with a piece of greasy rag, trimmed up the ragged edges, and, in most cases, obtained sheets of tinned iron nearly equal to new; from these he made pannikins of graduated sizes, in fact a nest of them, one fitting into the other from the largest to the least, thus securing comfort and convenience to his party, and utilising material which many persons would have thrown away as useless.
In opening a packing case lined with tin, care should be taken to cut the edges as clean as possible, for not only are ragged points liable to tear the hands very disagreeably, but if you wish to make use of the tin in any other manner, it is of great importance that it should be kept quite clean, flat, and free from unsightly wrinkles; a smooth sheet of tin may be cut, turned, or bent almost at will, but if it has previously been wrinkled, it is absolutely impossible to restore it to flatness, and to make a true joint in it is as much out of the question as to write freely on note paper fall of unsightly folds or creases. For cutting tin or other sheet metal, a pair of small tin snips, say 8in. or 9in. in total length, will be found exceedingly useful: stout copper or sheet-iron may be cut with them.
Dishes and plates, to make.
To make plates or dishes of sheet iron or other metal, cut out a disc or oval, of the size you wish, and then draw a line parallel to the edge all round it (Fig. 18); then draw lines radiating from the centre, like points on a compass card, as many as you please, say twelve, which will divide each quarter into three parts, answering to the hours on a clock face.
Make a small hollow across the end of a block of wood, the stem of the nearest small tree cut off at a convenient length for instance, lay the edge of your plate on it with one of the radiating lines corresponding with the hollow; strike it with the edge of your hammer till you have slightly indented it, do the same on the opposite side, and then with the other two quarters; repeat this all round, and you will have a very neat and useful plate, with scolloped edges like the patty pans usually sold by tinmen (Fig. 19).
Rivets.
A few rivets of various sizes, of iron, tin, and copper, should be taken; but, if the work is to be exposed to the action of the water, care should be taken not to fasten iron sheets with copper rivets, as the action of the metals on each other will be most destructive.
Tin rivets may be used to fasten any other metal where great strength is not required, and they are very advantageous for many purposes, as handles of tin or copper pannikins. By these we mean rivets of tin, not of iron tinned over, which also are useful, but not so easily worked.
Make-shift forge and bellows.
To extemporise a forge and bellows, the natives of Africa and India, who invariably squat down to their work, simply make their fire on the ground, which is previously smoothed and clayed over; behind this is raised a bank or fence of clay, perforated for the admission of a tube, either of wood of the bark of a small tree, or of the horn of an ox, or other large animal.