MECHANICAL RESOURCES. 325 thrust beneath its runners as they progress. Before the huge mass will start, however, the straining cords and muscles have to be helped by a thrust from behind. This is given by means of a huge lever, upon which a number of men pull with ail their weight, while its curved foot is engaged under the sledge. A workman is occupied with the reinforcement of the fulcrum by thrusting a wedge in between its upper surface and the lower edge of the lever. When everything is ready a signal will be given, the men behind will throw their weight upon the lever, the sledge will rise a little, the ropes will strain and tighten, and the heavy mass will glide forward upon the greased rollers until arms and legs give out and an interval for rest is called, to be followed presently by a repetition of the same process. Every precaution is taken to minimize the effect of any accident that may take place in the course of the operation. Behind the sleclge spare ropes and levers are carried, some upon men's backs, others on small hand- carts. There are also a number of workmen carrying rollers. We shall only refer to one more of these reliefs and that the one with which the series appears to close (Fig. 152). This carved picture has been thought, not without reason, to represent the erection of the bull l in its destined place. After its slow but uninterrupted march the huge monster has arrived upon the plateau where it has been awaited. By one great final effort it has been dragged up an inclined plane to the summit of the mound and has been set upon its feet. Nothing remains to be clone but to pull and thrust it into its place against the doorway it has to guard and ornament. The same sledge, the same rollers, the same lever, the same precautions against accident are to be recognized here as in the last picture. The only difference is in the position of the statue itself. Standing upright like this it is much more liable to injury than when prone on its flank. New safeguards have therefore been introduced. It is packed under its belly with squares of wood and inclosed in scaffolding to prevent dangerous vibration. Additional precautions against this latter danger are provided by gangs of men who walk at each side and hold, some ropes fastened to the uprights of the scaffolding, others long forked poles engaged under its horizontal pieces. By these means equilibrium could be restored after any extra oscillation on the part of the sledge and its burden. 1 LAYARD, Discoveries, p. 112.
