Subject

An oil-can, a most necessary and useful object in a metal workshop, and in making this a large variety of processes have to be gone through.

The Joints

They are lap, folded, cramped, riveted, soft soldered, and screwed.

The Processes

The full-size elevation should be set out, and from this the development of the body and the handle. The drawings of the two patterns, allowing for shrinkage and turning, should be made full size. Then the two patterns could be turned out of boxwood, working accurately to the drawings. These patterns should be sent to the foundry to be cast in brass or gunmetal, while the other parts are being proceeded with. The next step is to cut out the development of the body and use it as a templet, or develop the body on to the metal being used, which should be 26 or 24 I.S.W.G., and cut it out with the snips; the burr should be rubbed off with a file, and the body bent up to shape on the funnel stake (Ch. xvi, f. 21, No. 24). If the joint in this is going to be the folded joint B or the cramped joint C, the edges should be prepared before bending the body into shape. When the body has been bent to shape the seam should be set down, so obtaining a neat and close joint, and the body measured and compared with the drawing. The circle for the bottom could now be cut out with the straight snips and trimmed up, a line drawn on it to correspond with the outside diameter of body, and the edge turned up as illustrated. The handle should now be cut out, the holes punched, and worked up to the shape required, and the spout and collar turned and screwed. The screwing could either be done with the taps and dies, or on the lathe with the inside and outside chasers as shown on p. 206. For method of holding turning tool for brass or gunmetal see Fig. 7, Ch. vii. The handle should now be fitted to the body and riveted on, and the collar soft soldered in position from the inside, also the inside ends of the rivets to prevent leakage. The bottom should now be fitted to the body and poppled, that is, it should be placed on a polished stake and struck a few blows with a light planishing hammer, thus making it springy. This allows the oil to be squirted out by pressing the bottom in. The edge, or lag as it is sometimes called, should be worked down on to the sides of the body and soft soldered, only a very small amount of solder to be used. It could now be washed clean, and polished with dry rouge.

Fig. 7.-Saw piercing in metal.

Fig. 8.-An oil-can, showing methods of construction.

Note

Method of dividing a line into any number of parts:-Draw the line you want to divide, say AB, and then another line AG at a suitable angle. Open the compasses a suitable distance and step off on the line AG the number of parts you want to divide the line AB into. Connect the end of the line B with the last division marked on line at G, then repeat on other side, keeping both lines AG and FB parallel, then connect the points on both lines and where the lines cut the line AB, that is the correct division or number of divisions. This can also be accomplished by only taking one line up at an angle, say AG, and after stepping off the necessary number of divisions, connect the last point with the end of the line AB, then put a set square with its one edge on the line, GB, and place a straight edge to the other side of the set square, now slide the set square along the straight edge, and mark off the divisions.