Plate 39, from Peter Nicholson’s “The Mechanic’s Companion” (which is simply a nice image that has nothing to do with the privacy policy…because nothing from an early 19th-century book does). See below for Nicholson’s description.

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Plate 39 Description:

Fig. 1 is a view of the end of the machine; the principal parts shown in this view are
A the pulley of the mandrel.
B and C sides of the frame supporting the pulley.
D frame for the rest to slide in.
E and F legs supporting the frame D.
G and H continuation of B and C below the frame of the rest.
I nut and screw under the frame of the rest.
K the elliptic chuck with two grooves, through which the knobs of the slider pass, and are connected on the outside by a strong bar of iron, which is screwed upon their ends. This also shows the screw for fastening the board to which the work is fixed. This frame is strongly braced to the roof, in order to keep it steady.
P the rest.
Q the piece by which the rest is fastened.
Fig. 2 a view of the inside of the chuck, containing the parts N and O: this side of the chuck being placed against the side C of the frame, Fig. 1.
N the board containing the slider O, showing the end of the screw which is fixed in the mandrel; the board N revolves round a centre, while the slider O not only moves round, but has a longitudinal motion to and fro in the part N.
Fig. 3 a view of the outside of the mandrel frame, showing the parts L and M.
L a part of the side C of the mandrel frame, showing the ring M which is fastened to 1t and which causes the reciprocal motion of the slider O in Fig 2.