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AMBURSEN HYDRAULIC CONSTRUCTION April apron August Bar Harbor Boston bottom broken rock building shown buttresses canal capacity cement coarse racks cofferdam completed concrete block concrete mixers concrete was laid construction plant contract covered crest crushed crusher dam as shown days later deck slab derricks downstream side eastern bank eastern section ELLSWORTH ENGINEER entire bulkhead ENTIRE DEVELOPMENT entrance excavation extended view extreme left extreme right February Federal Street feet Ferro-Inclave floor forebay foundations front Harbor and Union haunches Height installation interior January log sluice looking upstream lower machinery necessary Note Notice October openings passageway penstock photograph shows picture shows piers plans power house preceding progress put in place removed rollway and bulkhead roof second picture section shows sectional forms September showing the curve stairways steel stone piles storage stream structure SUPERINTENDENT taken temporary spillway timber tion Union River Power view showing wall waste gates western workmen yards