A "Double Screw" American pattern toolpost mounted on the standard compound slide rest. This heavy-duty tool holder was specified as standard on the 21" and larger machines

The "Double Screw" American pattern toolpost mounted on a plain cross slide - an ideal set-up for heavy-duty plain work where the inherent flexibility of the top slide was eliminated by not using it …..

An alternative to the Plain Cross slide was the "Round-block Toolholder" which converted the standard cross slide into a similarly robust unit suitable for heavy plain turning.

Rise and Fall Slide Rest and Toolpost
Once the tool was locked into its holder, its height could be finely adjusted by means of the ramp-mounted slide. A thread-chasing stop (illustrated) was available as an extra.

This very unusual toolholder, the "Full Swing Rest" was designed to be clamped to the wing of the lathe saddle and, as it name implied, enabled the maximum turning capacity of the machine to be used.
It could also be used in conjunction with the regular toolholders when it was required (or possible) to turn two steps at once.