100 Series Mk. 3 with a bar handle (rather than the later cast spade-type) lever on top of the screwcutting gearbox - and the clutch lever on the right-hand side of the headstock cover operating the original type of simple "cone" clutch. Note, on this maker's picture, the lack of a countershaft belt cover - a fault not remedied until the arrival of the Atlas 4800 version.

100 Series Mk. 3 Changewheel model with the gears set in a compound reduction to give a fine feed to the carriage drive.

100 Series Mk. 3. In war-time 1944, for obvious reasons, the production capabilities of most small lathes was emphasised - hence this advertisement by Clausing for the conversion of the tailstock into a turret unit with length stops and capstan-handle feed.