Hello Robert & others. I am doing this on the run, so apologies if this aspect has already been covered by someone in reply to Robert. To REALLY understand how to read and interpret the Griffiths maps, you need to absorb the information at this link: http://www.leitrim-roscommon.com/GRIFFITH/Griffiths.PDF (If I recall correctly, Boyd GRAY provides the URL/link to this document in his wonderful little free online Donegal genealogy booklet, so if you have read that booklet and worked through it, then this information will most probably be superfluous -- in which case I apologise for clogging up the list with another posting.) ray in oz ----- Original Message ----- From: <boydgray26@utvinternet.com> > Robert, > > The only numbers I can see on those 6 inch maps, apart from the ARPs, are > spot heights. Usually three figures but falling to two at the coast. I > can > see no other numbers. > > Also, although the maps may have been produced in 1837 to 1842, you must > realise that the Ordnance Survey work began in 1822 (at Magilligan Point > just across Lough Foyle in County Derry. It took them almost two decades, > using spot heights, to go all round Ireland and come back to Magilligan > Point, where, I believe they were less than an inch out. It was at a > later > stage that they then married the data they had collected in the Field, > House > and Quarto Books to the OS maps they had produced and started adding the > plots and the red lettering and working out who owed what. Red numbers > and > upper case letters referring to plots, red lower case letters referring to > houses. > > Now, Lindel mentioned the GVRBs (revision books) which take you up to > 1930, > with name changes indicating possible deaths and relationships, but, if > you > can find House Books for your area, these will have data relating to that > key missing period between the TABs and the GV, and again with name > changes. > They are on the LDS site so you can order the films. Have a look. Not > many > people know this. They are not for the inexperienced. But they can have > very valuable information. Land Books and Quarto Books are less useful. > Boyd Gray -----Original Message----- > From: donegaleire-bounces@rootsweb.com > [mailto:donegaleire-bounces@rootsweb.com] On Behalf Of Robert Sutherland ... Unfortunately I am still puzzled by the numbers I referred to as well as a > new set of numbers I found. Please let me try to explain. > > The map I mentioned in my earlier post is on the OSi website. One of the > pages on that site says that the 6 inch refer to the years 1837 -- 1842. > So those maps are too early for Griffith's. I completely agree that the > numbers must somehow relate to the tenant or owner of a particular piece > of > land. So I am still searching for a source that connects the numbers and a > name. > > My new set of numbers are related to Griffith's. When I looked at > Griffith's > maps at griffiths.askaboutireland.ie I can see red outlines of parcels of > land and, within each parcel, red numbers (as well as some red lower case > letters). These red numbers are not the same as the numbers on the OSi > map. > As with the OSi maps, I assume that these red numbers can be connected to > the name of the tenant or owner. So I ask the same question: is there a > source that shows such a connection? ... Bob Sutherland