SD Side MOD6/L-10T
SD Single Drain or Ditch (SUSI/SIM Products) BB1969/MOD6/L
SD Strand MOD6/L-10T
SD Sun Dial DM
SD could be 1 of 4 OS things
MOD6/L-10T refers to:
Ibid., 'Shortened or special abbreviations for use only with road names
on 1:10000 published maps and town maps'
BB1969 refers to The Blue Book - Instructions to Draughtsmen,
Examiners and Area Revisers, Fourth Edition, 1969
MOD6/L referse to Module 6, section L, revised to Amendments nos 2
(May 1986) and 4 (October 1987)
DM refers to J.B. Harley, Ordnance Survey maps: a descriptive manual,
(Southampton, OS, 1975), pp.169ff.
http://www.ordnancesurvey.co.uk/oswebsite/aboutus/reports/misc/ab
breviations.html#s
You might have a sun dial, I wonder if the "works" was a clock factory?
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