Re: Map required
is http://www.mapmaker.com/v3/index.htm a possible solution for you? Thibaud At 20:14 16-8-2014, Tony Moss wrote: Hi all, For a sundialling purpose I need a map of the British Isles in Mercator's Projection. All I have found so far is a webpage purporting to offer a Mercator print but its latitude lines are curved and the longitude lines converge to the north. My old schoolroom World Map has the UK too small to be useful. Something around A4 size would be ideal. Suggestions welcome. Thanks in anticipation, Tony Moss --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- Th. Taudin Chabot, . tcha...@dds.nl --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Re Map required
In message 53f0418a.9060...@zooplankton.co.uk Frank Evans frankev...@zooplankton.co.uk wrote: Hi Tony, Do you need a place map or just one where you can enter lat.-long.? If the latter you just need a chart. Maybe Lilley and Gillie, chart agents, in North Shields can help. Best, Frank 55N 1W On 16 Aug 2014, at 19:14, Tony Moss tonylindi...@talktalk.net mailto:tonylindi...@talktalk.net wrote: Hi all, For a sundialling purpose I need a map of the British Isles in Mercator's Projection. All I have found so far is a webpage purporting to offer a Mercator print but its latitude lines are curved and the longitude lines converge to the north. My old schoolroom World Map has the UK too small to be useful. Something around A4 size would be ideal. Suggestions welcome. Thanks in anticipation, Tony Moss Is THIS the sort of thing you want Tony? - see the attachment, (which I have kept small to avoid the 'filter' for this List). You might be able to find suitable maps, via Google - though as Frank Evans suggests, a good 'chart supplier' will be best. Regards, Linda Reid. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Re Map required
Hi Tony, Looking at Linda's map, are you rooting for Scottish independence?! Best wishes, John -Original Message- From: Linda Reid Sent: Sunday, August 17, 2014 10:13 AM To: sundial@uni-koeln.de Subject: Re: Re Map required In message 53f0418a.9060...@zooplankton.co.uk Frank Evans frankev...@zooplankton.co.uk wrote: Hi Tony, Do you need a place map or just one where you can enter lat.-long.? If the latter you just need a chart. Maybe Lilley and Gillie, chart agents, in North Shields can help. Best, Frank 55N 1W On 16 Aug 2014, at 19:14, Tony Moss tonylindi...@talktalk.net mailto:tonylindi...@talktalk.net wrote: Hi all, For a sundialling purpose I need a map of the British Isles in Mercator's Projection. All I have found so far is a webpage purporting to offer a Mercator print but its latitude lines are curved and the longitude lines converge to the north. My old schoolroom World Map has the UK too small to be useful. Something around A4 size would be ideal. Suggestions welcome. Thanks in anticipation, Tony Moss Is THIS the sort of thing you want Tony? - see the attachment, (which I have kept small to avoid the 'filter' for this List). You might be able to find suitable maps, via Google - though as Frank Evans suggests, a good 'chart supplier' will be best. Regards, Linda Reid. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Re Map required
In message 0140891B818E4FDEAEFAD2DD82D8EF4F@FoadPC John Foad john.f...@keme.co.uk wrote: Hi Tony, Looking at Linda's map, are you rooting for Scottish independence?! Best wishes, John Yes, the Mercator projection distorts areas in such a way that the Northerly locations are given a much greater 'prominence'. If you want a map with orthogonal Latitude and Longitude lines, plus which keeps land AREAS in 'real' proportions - have you considered using a map which has the Peters Projection? David Andersson. -Original Message- From: Linda Reid Sent: Sunday, August 17, 2014 10:13 AM To: sundial@uni-koeln.de Subject: Re: Re Map required In message 53f0418a.9060...@zooplankton.co.uk Frank Evans frankev...@zooplankton.co.uk wrote: Hi Tony, Do you need a place map or just one where you can enter lat.-long.? If the latter you just need a chart. Maybe Lilley and Gillie, chart agents, in North Shields can help. Best, Frank 55N 1W On 16 Aug 2014, at 19:14, Tony Moss tonylindi...@talktalk.net mailto:tonylindi...@talktalk.net wrote: Hi all, For a sundialling purpose I need a map of the British Isles in Mercator's Projection. All I have found so far is a webpage purporting to offer a Mercator print but its latitude lines are curved and the longitude lines converge to the north. My old schoolroom World Map has the UK too small to be useful. Something around A4 size would be ideal. Suggestions welcome. Thanks in anticipation, Tony Moss Is THIS the sort of thing you want Tony? - see the attachment, (which I have kept small to avoid the 'filter' for this List). You might be able to find suitable maps, via Google - though as Frank Evans suggests, a good 'chart supplier' will be best. Regards, Linda Reid. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Map required
Hi David, The 'Peters Projection' you mention sounds very close to what I am seeking. Can you recommend a source? Thanks in anticipation, Tony M. -Original Message- From: David Andersson davey.anders...@gmail.com To: sundial@uni-koeln.de Sent: Sun, 17 Aug 2014 12:18 Subject: Re: Re Map required In message 0140891B818E4FDEAEFAD2DD82D8EF4F@FoadPC John Foad john.f...@keme.co.uk wrote: Hi Tony, Looking at Linda's map, are you rooting for Scottish independence?! Best wishes, John Yes, the Mercator projection distorts areas in such a way that the Northerly locations are given a much greater 'prominence'. If you want a map with orthogonal Latitude and Longitude lines, plus which keeps land AREAS in 'real' proportions - have you considered using a map which has the Peters Projection? David Andersson. -Original Message- From: Linda Reid Sent: Sunday, August 17, 2014 10:13 AM To: sundial@uni-koeln.de Subject: Re: Re Map required In message 53f0418a.9060...@zooplankton.co.uk Frank Evans frankev...@zooplankton.co.uk wrote: Hi Tony, Do you need a place map or just one where you can enter lat.-long.? If the latter you just need a chart. Maybe Lilley and Gillie, chart agents, in North Shields can help. Best, Frank 55N 1W On 16 Aug 2014, at 19:14, Tony Moss tonylindi...@talktalk.net mailto:tonylindi...@talktalk.net wrote: Hi all, For a sundialling purpose I need a map of the British Isles in Mercator's Projection. All I have found so far is a webpage purporting to offer a Mercator print but its latitude lines are curved and the longitude lines converge to the north. My old schoolroom World Map has the UK too small to be useful. Something around A4 size would be ideal. Suggestions welcome. Thanks in anticipation, Tony Moss Is THIS the sort of thing you want Tony? - see the attachment, (which I have kept small to avoid the 'filter' for this List). You might be able to find suitable maps, via Google - though as Frank Evans suggests, a good 'chart supplier' will be best. Regards, Linda Reid. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Map required
Dear Tony, What a fun thread you have spawned! Mercator is possibly the most famous Belgian, not that Belgium existed in his day but let's overlook that detail. The mathematics of Mercator's projection is quite challenging. Certainly Mercator himself didn't understand it! The first proper analysis was by Edward Wright who was a Fellow of Gonville and Caius College Cambridge in the days when there were 67 sundials in Caius Court. They are now down to their last six. To be sure the projection distorts sizes so Greenland appears about the same size as Africa but the UK is pretty small and the distortion is minimal. I do not understand Linda's map! As John Foad didn't quite say, this is decidedly an Alex Salmond projection. I'd use Mercator's projection for your project if possible. After all, that's what the Ordnance Survey use, albeit they turn the projection through a right-angle (the equator runs north to south). Peters's projection is really (in my view) the Gall Orthographic (Peters was over 100 years after Gall). It has no special advantages for a region the size of the U.K. I hope you find a proper map soon! Frank --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Map required
In message e1xj1zw-0004rj...@mta1.cl.cam.ac.uk Frank King frank.k...@cl.cam.ac.uk wrote: Dear Tony, What a fun thread you have spawned! Mercator is possibly the most famous Belgian, not that Belgium existed in his day but let's overlook that detail. The mathematics of Mercator's projection is quite challenging. Certainly Mercator himself didn't understand it! The first proper analysis was by Edward Wright who was a Fellow of Gonville and Caius College Cambridge in the days when there were 67 sundials in Caius Court. They are now down to their last six. To be sure the projection distorts sizes so Greenland appears about the same size as Africa but the UK is pretty small and the distortion is minimal. I do not understand Linda's map! As John Foad didn't quite say, this is decidedly an Alex Salmond projection. I'd use Mercator's projection for your project if possible. After all, that's what the Ordnance Survey use, albeit they turn the projection through a right-angle (the equator runs north to south). Peters's projection is really (in my view) the Gall Orthographic (Peters was over 100 years after Gall). It has no special advantages for a region the size of the U.K. I hope you find a proper map soon! Frank --- https://lists.uni-koeln.de/mailman/listinfo/sundial As Frank King mentioned, the subject of map 'projections' can be a tricky one - and most of us probably think of school atlas maps, where it is likely to be one based on conical with two standard parallels, where (as Tony Moss said), Latitude lines will be slightly curved, and Longitude converging to the North. However, Tony definitely wants 'orthogonal' (i.e. straight and at right-angles) lines of Latitude and Longitude - which rather restricts the projections you can use, though Tony did not give his reasons WHY the map had to have these specific properties. Strictly speaking, the UK Ordnance Survey 'National Grid' is not based on a Transverse Mercator projection (as Frank King suggested) - but here are two websites, with more information. http://en.wikipedia.org/wiki/Map_projection http://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid I hope they might be useful, and not even more confusing! Sincerely, Keith Christian. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Photo-etching sundials
Hello dialing friends, In a recent posting, Jack Aubert wrote: Our own Tony Moss is probably the foremost world expert in photo etching. He has uploaded a two-part video on you tube showing the process of etching a clock face with all the information one you would need to get started photo etching brass dials with ferric chloride. Although about 14 years ago I helped (mostly I watched and got in the way) Tony use his process for one of my sundial designs, I didn't know about his subsequent videos. They're certainly well worth viewing and may be found here: Part 1 https://www.youtube.com/watch?v=ML37yRmAsOA Part 2 https://www.youtube.com/watch?v=PAW0q6i7aqg Thank you, Tony! Best regards, Mac P.S. For additional information about photo-etching dials, contact Jack Aubert (j...@chezaubert.net) and request a copy of his how to document and information about obtaining materials and optional tools. Thanks Jack! --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Map required
Hi Keith, Many Thanks for the website references which take me some way beyond what I learned for 'A' Level geography many years ago. A very interesting browse in fact. Best, Tony M. -Original Message- From: Keith Christian keith.christ...@fastmessage.co.uk To: sundial@uni-koeln.de Sent: Sun, 17 Aug 2014 19:10 Subject: Re: Map required In message e1xj1zw-0004rj...@mta1.cl.cam.ac.uk Frank King frank.k...@cl.cam.ac.uk wrote: Dear Tony, What a fun thread you have spawned! Mercator is possibly the most famous Belgian, not that Belgium existed in his day but let's overlook that detail. The mathematics of Mercator's projection is quite challenging. Certainly Mercator himself didn't understand it! The first proper analysis was by Edward Wright who was a Fellow of Gonville and Caius College Cambridge in the days when there were 67 sundials in Caius Court. They are now down to their last six. To be sure the projection distorts sizes so Greenland appears about the same size as Africa but the UK is pretty small and the distortion is minimal. I do not understand Linda's map! As John Foad didn't quite say, this is decidedly an Alex Salmond projection. I'd use Mercator's projection for your project if possible. After all, that's what the Ordnance Survey use, albeit they turn the projection through a right-angle (the equator runs north to south). Peters's projection is really (in my view) the Gall Orthographic (Peters was over 100 years after Gall). It has no special advantages for a region the size of the U.K. I hope you find a proper map soon! Frank --- https://lists.uni-koeln.de/mailman/listinfo/sundial As Frank King mentioned, the subject of map 'projections' can be a tricky one - and most of us probably think of school atlas maps, where it is likely to be one based on conical with two standard parallels, where (as Tony Moss said), Latitude lines will be slightly curved, and Longitude converging to the North. However, Tony definitely wants 'orthogonal' (i.e. straight and at right-angles) lines of Latitude and Longitude - which rather restricts the projections you can use, though Tony did not give his reasons WHY the map had to have these specific properties. Strictly speaking, the UK Ordnance Survey 'National Grid' is not based on a Transverse Mercator projection (as Frank King suggested) - but here are two websites, with more information. http://en.wikipedia.org/wiki/Map_projection http://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid I hope they might be useful, and not even more confusing! Sincerely, Keith Christian. -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Map required
A simple rectangular projection where Longitude is the X coordinate and Latitude is the Y coordinate also has straight and perpendicular lines. And it can go all the way to 90 North. Of course, longitude is very distorted at the poles. http://en.wikipedia.org/wiki/Equirectangular_projection Many Thanks for the website references which take me some way beyond what I learned for 'A' Level geography many years ago. A very interesting browse in fact. Best, Tony M. --- https://lists.uni-koeln.de/mailman/listinfo/sundial
