. Scientific American Volume 91 Number 09 (August 1904). er be correct, that the coatingso made does not appear colored when examined bytransmitted light, and also that this coating absorbsa fraction only of the light transmitted. The light rays in passing through the elementaryscreens, orange, green, and violet, reconstruct whitelight, if the number of surfaces or elementary screensfor each color, and the depth of coloration of these,are in accordance with the relative proportions of thosewhich are found in white light. This thin trichromatic coating being formed is thencoated with a sensitiv
. Scientific American Volume 91 Number 09 (August 1904). er be correct, that the coatingso made does not appear colored when examined bytransmitted light, and also that this coating absorbsa fraction only of the light transmitted. The light rays in passing through the elementaryscreens, orange, green, and violet, reconstruct whitelight, if the number of surfaces or elementary screensfor each color, and the depth of coloration of these,are in accordance with the relative proportions of thosewhich are found in white light. This thin trichromatic coating 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 the screens they encounter, a variableabsorption before having any influence on the sensitivecoating. By this means a color selection should be effectedby means of the microscopic elements and making it. 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 carry 8,000 cubic feet of water per secondwithout making a too rapid current. This amount ofwater must ultimately flow through the river to thedrainage canal. The time for completing the work isto be limited to May 1, 1907, but the tunnels are tobe removed so that half of the channel shall be opento navigation by April 1, 1905, says Engineering will be necessary to abandon these tunnels at once,and cofferdams will have to be built to the center ofthe river, enabling the contractor to build half of thenew tunnel while leaving the other half of the s*—~afree to navigation. Regarding the Van Buren Streettunnel, Col. Ernst reports t
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