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CONTENTS.
PAGE
The Philadelphia Gas Works
Reservoir Dam across the Swatara, Pennsylvania
Twin Locks on the Schuylkill Canal at Plymouth
I
86
88
Bay of Delaware and Delaware Breakwater
90
-Philadelphia Water Works
105
Dam No. I. on the Eastern Division of the Sandy and Beaver
Canal, Ohio
122
Lock on the same
124
Joshua's Falls Dam, James River and Kanawha Canal, Vir-
Lock Gates, Mitre Sills, &c. of the James River and Kanawha
153
157
158
160
Canal
164
WILLIAM STRICKLAND, ARCHITECT AND CIVIL ENGINEER. EDWARD H. GILL, CIVIL ENGINEER.
HENRY R. CAMPBELL, CIVIL ENGINEER.