Maggie,
I went to British Library for a few hours in 2009 to search for one of JS Snr's Journals, in the hope it may give educational titles or any other reference that could assist in researching him further.
THe 1835 Journal was part of a rare book and could not be copied or scanned, but I was able to review.
British Library had the author down as John William James Stephenson, so I was quite exicited by this as only seen references as just John Stephenson. However in reviewing book the cover page showed the following:
'Treatise on the manufacture of saltpetre, descriptive of the operations and proper plans to be used for the manufacture of culmee & cooteah'
'Dedicated by permission to the Chamber of Commerce of Calcutta by John Stephenson, Calcutta 1835 Late Superintendant of the Hon Company's saltpetre factories in Behare'.
Where the BL got the name JWJS from this was unclear. However they did have another reference to a Elementary Treatise on Mechanics by JWJS but this was dated1864. In the end I concluded the 1835 book indexed to JWJS was incorrect.
Just mentioning this so you don't repeat this search when you are at BL. BL Ref:
http://catalogue.bl.uk/F/Q45IBS2IDSB1C38T3MLVSM29X33BSAGLRAHMXABEJRBNK4K19N-16024?func=find-acc&acc_sequence=027669987Ian