Manuals for all Burdett grinders are available
Machine tool makers G.W.S.Burdett was based at Eastgate, in Peterborough England and offered three versions of their horizontal-spindle surface grinders, the Mk.1 Model 70, the Mk.2 Models 70, 75 and 77 and the Model 921. They also manufactured 6-inch, 8-inch and 12-inch stroke toolroom-class slotting machines and could also built, to a customer's particular requirements, special machines for production and other uses.
Full details and technical specifications of the grinders is shown below and on the linked pages.
High-resolution pictures--may be slow to open