. St. Nicholas [serial]. morning was so full of interest that Jackcould scarcely believe it was noon when thewhistle blew and reminded him it was time to gohome. It was long before he had another chanceto look at the work, although he saw Perry ratherfrequently. Perry often climbed up Snake Trailto the top of Eagle Bluff to gaze through hisfield-glasses at the wonderful panorama, and,when he chanced to meet him, have a chat withJack and tell him all the latest developments. Work at Thunder Creek dam had progressed rapidly. The entire site of the foundations hadbeen surrounded. The greatest dif
. St. Nicholas [serial]. morning was so full of interest that Jackcould scarcely believe it was noon when thewhistle blew and reminded him it was time to gohome. It was long before he had another chanceto look at the work, although he saw Perry ratherfrequently. Perry often climbed up Snake Trailto the top of Eagle Bluff to gaze through hisfield-glasses at the wonderful panorama, and,when he chanced to meet him, have a chat withJack and tell him all the latest developments. Work at Thunder Creek dam had progressed rapidly. The entire site of the foundations hadbeen surrounded. The greatest difficulty hadbeen to make a joint between the foundation al-ready completed and caisson No. 2. By referringto Figure 2, which is a cross-section of the dam,it will be seen that the down-stream face of thedam was formed with what is known as an ogeecurve and then slanted forward at a sharp anglewhich made the toe extend well in advance ofthe crest of the dam. Piles, made of squaredtimber, were driven in two rows through the. WITH A MIGHTY LUNGE THE CAISSON SPLASHED INTO THE RIVER. material that had drifted over the toe. Strips ofwood were nailed to the piles to form tonguesand grooves which would lock one pile to theother. The piles were cut at the bottom to fitthe contour of the dam. The material betweenthe rows was dredged out, and divers closedup any gaps between the dam and the bottom ofthe piles. But now all work had stopped, for it wasChristmas Day; and when Jack came slippingand sliding down Snake Trail to make his firstvisit in weeks, he found the camp every one, including Perry, had gone totown. The chief engineer, Mr. Barto, however,was on hand inspecting the work. Jack hungaround, longing to have a talk with him, butrather shy about addressing him. Mr. Barto was a man who never forgot a , Jack! he cried, as he noticed the boyhanging around. What do you think of it ? Weare getting along pretty well, are nt we? Weought to be pumping out the coffe
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