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23. Six-inch (1:10,560) London and its environs, sheet 7, with experimental hachures (CCSA 218A/11)

 The skeleton map of London surveyed in 1848-50 was published at three scales, at 1:1056 in 487 sheets, at 1:5280 in 44 sheets, and at the six-inch nominally in 16 sheets. It was an outline map showing only building frontages, street names and altitude information. This particular copy has brown hachures, presumably applied for some experimental purpose since they do not conform to the undulations of the land covered. From a copy in the Map Library, School of Geography and Earth Sciences, University of Birmingham

 33. Six-inch Suffolk sheet 74SW, with experimental hachures (CCSA 218A/21/1) 

This is a copy of the first edition sheet published in 1889, with horizontal hachures experimentally applied to the western half. It is not known when these were added. The eastern half is in the standard specification. From a copy in the Map Department, Cambridge University Library, at Maps.aa.G.014.5 

80. Six-inch military and police map of Belfast, 1921 (CCSA 218B/47/2) 

Compiled from six-inch sheets revised in 1901-2, and set slightly north and east of County Down sheet 4. The map is overprinted in blue with the county borough boundary and a key to police barracks, and in red with police districts and military concentration and blocking points. Catholic areas are shaded green. Also overprinted in red is an alpha-numeric three-inch grid.

 98. Six-inch Portsdown Hill and Hilsea sheet 1, 1914 (CCSA 218B/49/9) 

99. Six-inch Portsdown Hill and Hilsea sheet 2, 1914 (CCSA 218B/49/10)

 This pair of special six-inch sheets were prepared by the Ordnance Survey for War Department use. The full range of the Palmerston forts and the Hilsea Lines defensive systems north of the Portsmouth naval base are shown. There are contours in blue at one hundred feet intervals. One function of the the map was to act as an index to special sheets at a larger scale, presumably 1:2500. From copies in the Map Department, Cambridge University Library, at Maps.aa.G.014.11 and 12 

202. Six-inch Kent sheet 35 (CCSA 218B/52/30)

 This defective copy of six-inch Kent sheet 35 is annotated "Unfinished". It was surveyed in 1872-3 and engraved in 1875. From a copy in the Map Department, Cambridge University Library, at Maps.aa.G.014.6 

211. Six-inch Yorkshire sheet 231 - Unfinished Impression.

 1st edition sheets of the West Riding of Yorkshire seem to have been made available in an unfinished state. Two examples are known that are coloured and mounted by the Manchester agent Hansbrow in book-fold covers with additional material folding out from the left-hand leaf - in this instance Examples for the Characters of the Writing. It is sometimes stated that these pre-publication copies were to assist geologists in their investigations, but it seems unlikely that geologists would have wanted the parishes colour-washed as we see here. Necessarily, any pre-publication copy will have the publication date left blank. In this instance, the lower marginalia are wholly missing: the odd marks that are visible are possibly offsets from other copies. It will be observed also that the sheet number, top-right, is only engraved in hair-line. Note also the blind-stamp, dated 7 Feb 1854, with the words UNFINISHED IMPRESSION. What makes it unfinished is the complete absence of contours. (Some years later, the Survey would issue uncontoured sheets routinely as an Advance Edition.) Specimens are also known with the contours stopping just short of the neatline, presumably because the adjoining sheet(s) had not yet been contoured and it was important that the contours should run smoothly from one sheet to the next. But the most important aspect of this sheet is that it shows an earlier state of railway development than any other known specimen, with 'Halifax Station' as a terminus to the south of the town. From a copy in a private collection 

213. Six-inch map of Belfast and Surrounding Districts in 4 sheets, 1939.

 Although these sheets were formally published and were subject to copyright deposit, they are not widely known. They might be regarded as the last flowering of the coloured Town Maps from the 1920s. This particular set seems to come from OSNI itself, each sheet bearing in its lower margin a list of what seem to be the negative or plate numbers for each of the colours. Just one sheet is included here; the full set is to be deposited at Cambridge.