NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Charts
From: Gary LaPook
Date: 2009 Jan 19, 18:37 -0800
From: Gary LaPook
Date: 2009 Jan 19, 18:37 -0800
Frank, thanks for the link to the charts. I was just looking at: http://historicalcharts.noaa.gov/tiled_jpgs_done/zoomifyURLDrivenWebPage.htm?zoomifyImagePath=752-12-1947 which is the old 752 chart for Chicago. I noticed when I used this chart when I lived in Chicago that the street grid does not run true north. If you go to this link and follow the 87� 39' longitude line you will see that the north-south streets in Chicago run about 359� true. I know the city was surveyed with the township-range grid but I thought that this would cause the Chicago grid to run true north. I noticed that when driving north that at several main streets ( I think 39th was one of them) and spaced eight miles apart you make a slight jog to the west and then continue north on the same street. I bellieve that this is a result to the township-range survey method. But I still don't understand why the streets are not true north and I am sure that the surveyors wouldn't have made such a large error. Do you have an explanation? gl On Jan 19, 2:43�pm,wrote: > Yes. The Office of Coast Survey has compiled a wonderful collection of old charts. Here's the search page:http://historicalcharts.noaa.gov/historicals/historical_zoom.asp > > Enter "Long Island" under keywords, set the state to "New York", click "Submit", and you will get a list of some 82 charts (in no particular order). It's a lot of fun. > > -FER --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---