Ordnance Survey - Quarter Inch to the Mile Maps of Scotland, 3rd edition - 1921-1923
These maps at quarter inch to the mile (1:253,440) were reduced from larger-scale mapping at the half-inch and one-inch to the mile scales, primarily dating from the third national revision of 1912-1923. With some minor variations, each sheet covers 72 x 108 miles, with all of Scotland covered in ten sheets. The attractive and distinctive layer colouring is especially good for indicating relief, and there were several later 'aeronautical issues' of the series in the 1920s and 1930s. This series was also published as an atlas in 1924. For the first time for the Quarter-Inch series of Scotland, it was constructed on Cassini's Projection with a point of origin at Delamere Forest - as also for the One-Inch Popular edition of Scotland, which began publication at the same time.
- View the maps with a graphic index of Scotland
- View seamless layer of Quarter-Inch mapping on a satellite image base
| Sheet Number and Name | Revision details | Publication Date |
| Sheet 1 - The Border | 1921 | |
| Sheet 1 - The Border | Minor corrections 1923-24 | ca. 1925 |
| Sheet 1 - The Border | Roads rev. (England) to Sep.1929. Railways inserted to 1929 Minor corrections 1930 | ca. 1930 |
| Sheet 1 - The Border | Roads rev. (England) to Sep.1929. Railways inserted to 1929 Minor corrections 1930 | ca. 1930 |
| Sheet 1 - The Border | Roads rev. (England) to Sep.1929. Railways inserted to 1929 Minor corrections 1930. Town plans sheet tipped in cover | ca. 1933 |
| Sheet 2 - Scotland South West | 1922 | |
| Sheet 2 - Scotland. South West | Roads partially rev. to 1924. Minor corrections 1931 | ca. 1932 |
| Sheet 3 - The Forth & Tay | 1923 | |
| Sheet 3 - The Forth & Tay | 1923 | |
| Sheet 3 - The Forth & Tay | Roads partially rev. 1930. Railways rev. 1930. Minor corrections 1930. Town plans sheet tipped in cover | ca. 1931 |
| Sheet 4 - The Southern Islands | 1923 | |
| Sheet 4 - Glasgow, Oban and the Southern Islands | Minor corrections to 1924-7. H. Rees label pasted on cover | ca. 1927 |
| Sheet 4 - Glasgow, Oban and the Southern Islands | Roads partially rev. 1931. Minor corrections 1931. Gaelic glossary inside cover | ca. 1932 |
| Sheet 4 - Glasgow, Oban and the Southern Islands | Roads partially rev 1931. Minor corrections 1933 | ca. 1933 |
| Parts of sheets 4, 3, 2, 1 - Glasgow and District | Minor corrections 1929 | ca. 1930 |
| Sheet 5 - The Eastern Highlands | 1923 | |
| Sheet 5 - The Eastern Highlands | Roads rev. 1934. Minor corrections 1934. Town plans sheet tipped in cover | ca. 1934 |
| Sheet 6 - The Western Highlands | 1922 | |
| Sheet 7 - Scotland North | 1923 | |
| Sheet 7 - Scotland North | Roads rev. 1927-8. Minor corrections 1931. | ca. 1932 |
| Sheet 7 - Scotland North | Roads rev. 1927-8. Minor corrections 1933 | ca. 1933 |
| Sheet 8 - The Northern Hebrides | 1923 | |
| Sheet 9 - The Orkney Islands | 1923 | |
| Sheet 10 - The Shetland Islands | 1923 | |
| Sheet 10 - The Shetland Islands | Roads rev. 1928-9. Minor corrections 1931. Gaelic glossary inside cover | ca. 1932 |