?Z^^£^_s £gEas»*» -«^<& ^^^PWW ^^^^^^v^^^r^^^-^^^^r^^^^m ■ v m w v m m i MERICAN CIENTIFIC *-* ,-J^<^gjffiftL3^fVa*-'--* *-' ^^^7 I 10 CENTS A IOPI Vol. XCV.-No. 1. i NEW YORK, JULY 7, 1906. L S3.00 A YEAR. Established 1845. J … Peterborough Lock in Course of Construction. A General View of One of the Peterborough Locks. View on the Opening Day. The West Chamber is Elevated to Full Height. The East Chamber Contains a Steamer About to be Raised. THE PETERBOROUGH LIFT-LOCK OF THE TRENT VALLEY CANAL.—[See page 8.J
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