Publication data
First published1911
Last published1912
Sheet data
Number of sheets360 (planned)
7 (published)
Sheet size18mi × 12mi
Technical data
Geodetic datum?
EllipsoidAiry 1830
Projection typeCassini
Projection originDelamere (53.221°N
2.684°W OSGB36 datum)
Unit of measurementFoot of O1
Map scale1:63 360

1911-1912: Short-lived

The 1-inch Fourth Edition was the last to use the ‘small’ 18 × 12-mile sheet lines originally drawn up for the 1-inch New Series. The Fourth Edition maps used the survey information from the third national revision of 1909-1910, which was abandoned. Only seven sheets in the series were ever published, covering part of eastern Kent.

The series was superseded by the introduction of the 1-inch Popular Edition.

Page last updated: 14 April 2012