Original sentence: According to Wainwright (A Wainwright, Pennine Way Companion) the support timbers for the Ramsden theodolite, used by the Royal Engineers in the original Ordnance Survey, were still to be found here many years later
Edited sentence: According to Wainwright the support timbers for the Ramsden theodolite, used by the Royal Engineers in the original Ordnance Survey which began in 1784, were still to be found here many years later