The National Geographic Magazine, Volume 191National Geographic Society., 1997 - Geography |
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Page 116
... tunnel . This smoke comes from 500 pounds of dynamite that the sand- hogs have just detonated at the end , or " head- ing , " of the tunnel . A hundred detonators , timed to explode thousandths of a second apart , have loosened about 12 ...
... tunnel . This smoke comes from 500 pounds of dynamite that the sand- hogs have just detonated at the end , or " head- ing , " of the tunnel . A hundred detonators , timed to explode thousandths of a second apart , have loosened about 12 ...
Page 124
... tunnel are far greater than a New York City police officer's chances of being killed while on duty . The third water tunnel , now 18 miles long , has cost more than a man a mile . At that rate , 42 more sandhogs will die before it is ...
... tunnel are far greater than a New York City police officer's chances of being killed while on duty . The third water tunnel , now 18 miles long , has cost more than a man a mile . At that rate , 42 more sandhogs will die before it is ...
Page 125
... TUNNELS Flowing downhill from distant reservoirs , water courses through deep tunnels and up riser Old water tunnel SOLID ROCK Bedrock lies only a few feet below midtown Manhattan and as close as 30 feet to the surface in downtown , one ...
... TUNNELS Flowing downhill from distant reservoirs , water courses through deep tunnels and up riser Old water tunnel SOLID ROCK Bedrock lies only a few feet below midtown Manhattan and as close as 30 feet to the surface in downtown , one ...
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