Sometimes badged as "Bridgeport" the Adcock & Shipley 1ES millers replaced the 1E range which had been introduced in 1964. The 1ES was build on the same foundation design as the 1E and had three spindle bearings, with two of the pre-loaded, angular contact type mounted immediately behind the spindle nose., which carried a No. 40 International Standard Taper.
A 2 hp motor was fitted across the range and enclosed, with all the ancillary electrical equipment, inside the machine base.  In comparison with the 1E the makers claimed an improvement of 30% in table area and travel - and a 50% increase in the width of the knee-bearing area on the column, to which an improved knee-locking mechanism was also fitted.The range was divided into the "M" machines, which featured purely hand-feed tables, the "G" and "J" models with Mechanical Auto Feed and Auto-cycle mechanisms and the "AH" type - which were fitted with Auto Cycle arrangements driven by Air-hydraulic power.