of the north propelling of the smoked plate at a uniform rate of speed tunnel is now about 950 feet from the shaft. under the stylus. In the instrument illustrated this is ac- The caisson at the New York end we described and illus- complished by simply inclining the support of the plate and trated… … . flange along its outer and upper tracings are the microscope slide glasses with of plates was finished, and then the sides and arch were built, At a distance of 12 feet from the side of the cais- edge, which serves as a guide to the car wheel, and pushes ground edges. They may be readily smoked…
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