g being formed is thencoated with a sensitive panchromatic emulsion. If theplate so prepared is submitted to the action of a color-ed image, taking the precaution to expose through theback of the plate, the luminous rays pass throughthe elementary screens, and undergo, according totheir color and… … Tlie Chicago River Tunnels. Lowering the Chicago River tunnels has been report-ed on by Col. O. E. Ernst, U. S. Enginers. He recom-mends that the Washington Street and La Salle Streettunnels be lowered to give a depth of 26 feet in theriver, on the ground that such a depth would be re-quired to…
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