Continued:
Formed as a heavy, very rigid box casting strengthened by transverse ribs, the bed and headstock were cast as one. Two sets of ways were provided, those at the front being flat with 60° edges and arranged to carry a saddle topped by a slide set in line with the bed ways (rather than across them as on a normal lathe). This arrangement allowed a very precise lateral adjustment to be made to the tool setting - the feed screw carrying a micrometer dial reading to 0.00025". At the back, to carry the set-over tailstock (with a simple push-feed barrel) ways were formed with a flat at the rear and a V at the front. A simple lever-action cross slide was fitted with its movement measured and limited by a micrometer screw stop with a particularly large bronze dial reading to 0.0001" (the slide being advanced up to the stop to make the cut). Provision was made to read the micrometer dial and tool settings through a magnifying glass attached to a stem that passed through the pivot point of the cross-slide lever.
Because the cutting tool would have been required to make several passes up and down a workpiece, removing a only little material on each pass to machine it dead true, the countershaft was arranged to provide an automatic and instant forward-and-reverse drive. Running free on a hardened steel sleeve, the two V-belt driving pulleys were formed with saw-tooth dog clutches on their inner faces with, mounted between them, an engagement clutch (keyed to the sleeve) that could be moved from side to side to engage either. The clutch centre was connected to a lever pivoting from the front face of the headstock and could be operated either by hand, or automatically through a rod fitted with adjustable stops struck by tabs cast as part of the saddle - one being positioned to the left and the other to the right of the cross slide. The spindle was driven not by the belts, but through gearing, the arrangement of this (and the changewheel drive) being relatively complex and interesting: behind and fastened to the catchplate were two gears: the rear of the pair meshed with another half its size fixed to the end of the countershaft sleeve (this drive the spindle) while the second connected to a gear of the same size on the front end of the countershaft - that shaft passing through the hollow clutch sleeve and carrying the first gear of the changewheel train on its outer, lefty-hand end. Work was mounted between centres and driven in the usual way - pins on the catchplate turning dogs fastened to the workpiece -  this arrangement being essential for the highest accuracy. Although it was possible, of course, to machine the catchplate to carry a 3-jaw chuck, the makers certainly did not intend this to be done.
Even the arrangement of the changewheels (sufficient in number to generate pitches from 8 to 100 t.p.i.) was beautifully engineered with a T-headed stud located in a machined groove on the back of the twin-slot support bracket. The studs were retained by nuts on the outside, the slackening of which allowed (on some versions, if not all) a spring to push the unit loose and its position adjusted quickly and easily. Each changewheel was fitted to hardened and keyed running sleeve that slipped onto the fixed stud with retention by a short distance piece locked in place by a knurled-edge screw that could be released with just finger pressure.
As might be expected of such a high-quality machine, the changewheels and small accessories - centres, adaptors and drive dogs - were presented in a fitted wooden box.
By the 1930s the thread-correction lathe was obsolete, very accurate thread-grinding machines having being introduced in the UK by Matrix of Coventry (who published a very good book on the subject) in Germany by Lindner and (later) Reishauer and in Switzerland by SIP.