My enquiry is regarding the 6 inch to a mile mapping. I refer you to the specification for the 1:10560 mapping published in Table 12 on page 75 in Ã¢â‚¬Å Ordnance Survey Maps a descriptive manual by JB Harley.
It appears to me from the studying the old and modern 6 inch mapping that the thresholds shown on Table 12 on page 75 of Brian HarleyÃ¢â‚¬â„¢s manual applies to all the six inch maps including the 1901 and 1925 6 inch to a mile maps as well as the National Grid Regular Series 1:10560 maps a few years later. Presumably the specification on Table 12 is in fact the correct specification to paste on the back of each of these 1:10560 maps. I appears to me that the purpose of the 6 inch mapping series has not changed or evolved since the first map was produced at the 6 inch scale and that the specification published in Table 12 has always been adequate to the purpose and consistently applies to all the six inch series of mapping. I need you to confirm please that this is the correct specification for me to paste on the reverse side of the 1901 and 1925 6 inch maps and well as the National Grid six inch map.
I regret to inform you that Ordnance Survey is unable to help you with your enquiries as we do not hold this information. We have searched the Ordnance Survey reference library and we do not hold any records before the 1940’s Provisional Ordnance Survey National Grid series (that is, no County series which includes 1901 and 1925). Therefore the details in J B Harley are only appropriate for National Grid based surveys. I am afraid that we can offer no further opinion on this matter. It may be that the Charles Close Society or Royal Geographical Society might be able to assist you further in this matter.
They may be contacted at the Charles Society website,
Please also see the RQS site.
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Reference number: 67287 02/08