The screw-feed compound slide rest - which had no feed-screw graduations - fitted with a special boring toolholder with eccentric height adjustment - exactly like that used by Rivett on their "8-inch Precision".

Stark No. 3 lathe fitted with an eccentric-height adjuster boring tool mounted on a special slide to speed up repetitive boring and facing work. Whilst the cross feed used an ordinary lever-operated arrangement, the longitudinal feed was by a rack-and-pinion mechanism engaged by a large handwheel at the back of the unit.

Ball-turning Rest. A useful accessory able to generate spherical shapes from 1/8 to 2 inches in diameter.

The complete grinding assembly included the grinding head shown below, a special short, offset tailstock (around which the abrasive wheel could reach to grind pieces held between centres) and a countershaft unit with a long drum which allowed the compound slide with its grinding head to be placed anywhere on the bed.

Toolpost-mounted Grinding Attachment:
This early version, which lacked the heavier build of later designs, was described in the first catalogs as a simple "grinding attachment" and was intended for internal and light external grinding.
The unit was driven by a round rope driven from a long drum attached to the overhead countershaft and was usually clamped into the position usually occupied by the tool post - and was therefore adjustable through all the normal movements and angles associated with the compound slide. Whilst Stark eventually listed four different models to suit the various sizes of lathe, all had the same 17/16" spindle travel.
More pictures here.