The Harrison 140 was named after a its swing of 140 mm (11 inches) and was produced late in the life of the L5A/11-inch series. The lathe was mechanically identical to the earlier machines except for a squared-off headstock which may have contained slightly altered gear ratios. The front of the headstock was flat and carried a large rectangular plate on which were engraved the spindle speeds and either Harrision 140 or Harrison 11. The latter name was also used on the "round" headstock version - but on a narrow nameplate immediately below the high/low speed selection lever. The lathe is likely, from its name and the numbers encountered so equipped, to have been sold  largely as an all-metric machine, with an exclusively metric screwcutting gearbox (but one that could be converted to cut English and other threads) although the makers did list an English gearbox version with a 4 tpi leadscrew. Certain differences exist between the various screwcutting gearboxes in the range and if you have a 140 it is essential to have the right manual that lists the changewheel (and gearbox) combinations correctly. The only external differences between the 140 and the 11-inch was the shape of the headstock casting which was squared off and given a flat front; the headstock internals appear, however, to have been arranged in an identical fashion to those of the L5A and 11-inch models - although it is possible that some alterations to the gear ratios were made. Although the majority of 140s seem to have been built with a top speed of less than 1250 rpm they were fitted as standard with the special two ball-race supported clutch originally provided on the earlier 2000 rpm "high-speed" headstocks. To discover more about the 140, refer to the L5A and "11-inch" pages.