While not lathes the "M. S. Ault" and similar Yankee Paring and Slicing Machine are placed among the lathes in Apple Parers (Thornton 1997, p. 21). The machines use a pivot mechanism to switch between paring and slicing the apple. A lathe called the Yankee Machine for Paring and Slicing Apples manufactured by J. D. Seagrave also utilizes a pivot mechanism to switch from paring to slicing. The basic slicing mechanism for all three parers is the same.
I believe that the "M. S. Ault" is misidentified. I think the parer was actually manufacutred by M. Sault & Co of New Haven Connecticut. First, if one looks carefully at the markings there is no period at the end of S. Second, M. Sault & Co was an iron works from 1852 to 1864. The buisness would eventually become Yale Iron Works by the 1870's (Joslin, 2011).
The Yankee Paring and Slicing Machine was manufactured by
D. F. Randall of Chicopee Massachusetts. Interestingly, another identical parer carries a paper label identifying it as the Yankee Apple Paring Machine manufactured by Tenney and French of Orange, Massachusetts.
The Yankee and similar parer marked M. SAULT are geared machines with a hand-guided paring knife. One could make the argument that most primitives with hand-guided paring knives are returns since the paring knife on most must be manually reversed to the starting position.
The operator of the Yankee and M. SAULT cranks the gears while using a hand-guided paring arm to peel the apple. Once the apple is pared a spring lever is used to release the fork mechanism which can be rotated clockwise 90 degrees so as to position the fork and apple next to the slicer. The left hand can be used to rotate the small fork gear while the right hand cranks the wooden handle to slice the apple.