1.] The cables appear to have been of great strength, and are fastened carefully to four strong projecting pins--two near the front, two at the back part of the sledge, by a knot so tied that it would be sure not to slip.

[PLATE LXXXIX., Fig.

4.] Finally, as in spite of the rollers, whose use in diminishing friction, and so facilitating progress, was evidently well understood, and in spite of the amount of force applied in front, it would have been difficult to give the first impetus to so great a mass, a lever was skilfully applied behind to raise the hind part of the sledge slightly, and so propel it forward, while to secure a sound and firm fulcrum, wedges of wood were inserted between the lever and the ground.

The greater power of a lever at a distance from the fulcrum being known, ropes were attached to its upper end, which could not otherwise have been reached, and the lever was worked by means of them.
We have thus unimpeachable evidence as to the mode whereby the conveyance of huge blocks of stone along level ground was effected.

But it may be further asked, how were the blocks raised up to the elevation at which we find them placed?
Upon this point there is no direct evidence; but the probability is that they were drawn up inclined ways, sloping gently from the natural ground to the top of the platforms.