[Larger plate.]

[512]. Split bar grip, or tool holder.

[513]. Eye-bolt tool holder.

[514]. Hand pad for holding small tools.

[515]. Self-adjusting jaws for round articles.

[516]. Adjustable gripping tongs for lifting heavy stones, boxes, &c. See also [No. 761].

[517]. Revolving tool post, or head, to carry a variety of tools, each being required in use in a certain order, as in special repetition turning work.

[518]. Double screw gripping tongs.

See also [No. 944], [912], [918, 917], [919], [923].

The ordinary three or four-jaw chucks, wood chucks with centre screw or fork, and numerous varieties of self-centering chucks, are well known. See tool makers’ lists.