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Rockwell Delta 14" underdrive model.
An unusual feature of this lathe was the reversing mechanism fitted to the screwcutting gearbox. It enabled the longitudinal feed to shifted freely between neutral, forward or reverse whilst the machine was running - whilst an additional lever on the apron could be flicked between power cross feed and longitudinal feed - again under power. Separate shafts were fitted for screwcutting and power feeds.
Normally, changes in spindle speed were activated by a stand-mounted handle, immediately below the gearbox, but on the Option's List was a power-driven spindle-speed changer, operated by a lever fitted to the lower right-hand edge of the apron.; when fitted with this device there was no comparative positioning of wheel and scale to indicate the spindle r.p.m. and it was recommended that a headstock-mounted tachometer be fitted as well.
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