A home geography of New York city . , VMJ. l,y .Mn^us Ki: Bii;i)s-Eyi: View of ]\Iamiattan 36 CHAPTER V TOPOGRAPHY Let us take up each borough and study it by itself. Let us lookat the relief and the political maps while studying. Manhattan. The borough of Manhattan is an island. It issomewhat rectangular in shape and extends north and south. At the bottom of the political map you will find a scale. Findthe length of the island by using this scale. Measure the narrowestpart between the Hud-son and the Harlemrivers. Measure thewidth from a pointopposite Randallsisland to the Hudsonri
A home geography of New York city . , VMJ. l,y .Mn^us Ki: Bii;i)s-Eyi: View of ]\Iamiattan 36 CHAPTER V TOPOGRAPHY Let us take up each borough and study it by itself. Let us lookat the relief and the political maps while studying. Manhattan. The borough of Manhattan is an island. It issomewhat rectangular in shape and extends north and south. At the bottom of the political map you will find a scale. Findthe length of the island by using this scale. Measure the narrowestpart between the Hud-son and the Harlemrivers. Measure thewidth from a pointopposite Randallsisland to the Hudsonriver, and from a pointopposite Blackwellsisland to the Hudsonriver. Now measureacross that part of theisland opposite Brooklyn which you consider the widest. Fromyour measurements tell how long the island is; how wide it a map of the island quickly and roughly without lookingat the map. The southern end of the island is low; the northern end is to the southern end, then to the northern end. Throughout 37. View looking Nouth, Many Years ago, from SCHOOLHOUSE IN 42d StREET, BETWEEN 2d AND 3d Avenues 38 HOME GEOGRAPHY OF NEW YORK CITY the greater part of the length of Manhattan there is a central ridgeof rock sloping to the west, east, and south. Look at your reliefmap. In what direction will the drainage be ? Broadway is a goodguide as to the general direction of the ridge. There were lowerridges to the east of Broadway in early times. The ridge of rockrunning in the general direction of Broadway is the backbone ofthe island. In some places this rock rises over two hundred feetabove the level of the sea. In such places we have a hill. In other places the rock is be-low the surface of thestreets, where it can-not be seen. When erecting sky-scrapers in the lowersection of Manhattanbuilders are often com-pelled to dig downnearly one hundredfeet to reach rock for
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