Heidenhain Optical Reader. These units could be fitted in place of the dial indicators. The position was read from a combination of a magnified image of a precision ruler marked in mm and a direct-reading drum graduated in intervals of 0.01 mm

Universal Dividing Head equipped for direct dividing (by an indexing plunger into a gear) and quick workpiece clamping by a lever.  The plain tailstock shown is also equipped for quick clamping

A more complex dividing head was also available - the Universal Inclinable. With the same range of nose fittings as the standard head, this 4-inch (100 mm) centre height version had a body that could be rotated from horizontal to vertical. A 24-hole indexing plate was fitted as part of the standard specification, as was a set of three indexing plates.

Power-feed unit to provided a spiral indexing facility (used in conjunction with the Universal Milling Head). This employed a train of gears contained in a cast box with machined-in T-slots with a drive taken from the table's horizontal feed shaft - the gear set comprising wheels of: 24, 24, 28, 32, 40, 44, 48, 56, 64, 72, 86 and 100t.

A very much more complex and versatile dividing apparatus was thee Co-ordinate Rotary Table: this beautifully-made and heavy unit (176 lbs/80 kg) consisted of a rotary table, with worm drive plus and indexing-plate facility, mounted on an angle plate for direct fixing to the F4's vertical table. Integral with the rotary element was a compound slide rest that carried a 11.75" x  8.625" (300 x 220 mm) table with three T-slots. X and Y feeds were both 4.75" (120 mm) a travel that, although limited, was sufficient to allow the precise rectangular and polar positioning of small workpieces in relation to the spindle axis. Also shown is the Centering microscope.