Thom Shannon wrote: >Sent: 28 September 2007 1:06 PM >Cc: [email protected] >Subject: Re: [Talk-GB] mapping tunnels > >Isn't ASN just a compass? >
One thing to bear in mind is that many of our older tunnels that cross below rivers were built from cast iron segmental linings which may have some fun with a compass. Some nice shots of the Queensway tunnel construction here: http://www.liverpoolmuseums.org.uk/maritime/archive/stewartbale/work/tunnelw orker.asp try the zoom for a closer look cheers Andy Andy Robinson [EMAIL PROTECTED] _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk-gb
