Canterbury County Council Boundary Stones (2)

Following on from the previous post, these are the ten stones in existence that I am currently aware of.

Beverley Meadow (south west edge) 3c 1890
Beverley Meadow (south east edge)  3d 189?
St. Stephen's railway crossing            3g 1899
Langton Lane                                    26a  undated
Church Lane, Nackington                 29   .....
Orchard near Merton Farm               30   .....
'A copse south of Thanington'          ...    .....
South bank of Stour at Wincheap     33? 1890
North bank of Stour at Wincheap     33g undated
Cherry Garden Road                        (illegible)

Where ? indicates an uncertain inscription and ... indicates the inscription has yet to be seen by me.

I picked this map up today from the Westgate Hall collectors' fair. The red line marks the extent of the 'Liberties of the City of Canterbury' although I'm not sure that this is analogous to the C.C.C. boundary discussed here. The south west boundary certainly doesn't seem to match up with some of the stones listed above. Unfortunately the dealer I obtained it from did not know of its source; it is certainly pre-1846 (and probably pre-1830) as no railways are shown. The presence of the barracks gives an earliest date of 1794 which was when construction of the cavalry barracks commenced. 

Update: The map is taken from the Topographical Dictionary, circa 1850. Drawn by R. Creighton and engraved by J. & C. Walker. The green line shows the boundary of the old borough, the red line the boundary of the new borough. Now I just need to find out what 'old' and 'new' refer to!

Second Update: The map is a copy of an 1832 Boundary Commission report: http://www.visionofbritain.org.uk/maps/sheet/bc_reports_1832_v2/Kent_Canterbury

Map of Canterbury taken from the Topographical Dictionary c.1850