Wood frame with two open spools, top spool adjustable, may be raised and lowered by loosening thumb screw on frame, rack rests on triangular 3-legged wood base.
Machinery on top of a wooden loom. Single large treadle.
The dobby, also called the "witch" or "small Jacquard", was designed for weaving small geometrical or symmetrical figures requiring more harnesses than could be individually treadled.