d layer of concrete which covers the troughs entirely. Asheet of Holz cement ( a material similar to our tarred felt )was used to cover the layer of concrete and give it a water-proof surface. The troughs were made of iron five inches high,the width of base being twelve inches; the weight per… … Transverse Sec f/or? of F~/oor-.Sty/ss Northwestern ffa//wc*^ -9- TROUGH FLOORS Design by Mr. J. R. Worcester. From 1890 to 1893 the New York, Providence andBoston Railroad put in a considerable amount of iron and ballastbridge flooring on the same general principle as that which wasconstructed in…
Bridges · Theses
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