The tirr in this quarry was deposited about 25 yards from the working face by means of wheelbarrows. The cost of the drilling is under that of the previous case, which is accounted for by the motive power for the rock drill being supplied by one of the road authorities' steam road-rollers; the expenditure, however, includes a sum for depreciation of the engine. The appearance of this quarry during drilling operations is shown at fig. 88, and the effects of the blasting operations, which show an excellent result, are represented in fig. 89. Road-stone quarry No. 3. 225. Fig. 75, p. 151, shows the manner in which the bore-holes were placed; a cross-section (fig. 76) is also given, showing the general outline of the quarry face. The rock in this quarry is a hard and very tough basalt, and of a very solid nature. The amount of material required was 2000 tons, and the expenditure incurred for the quarrying operations is detailed in same way to that in the previous cases. The total quantity of rock quarried turned out to be 2102 tons. TABLE XXIV. Actual Cost of quarrying in road-stone quarry No. 3, |