from The Century Dictionary.
- noun A boy who helps a weaver in drawing the heddles to form the pattern of the cloth he is weaving; hence, a mechanical device employed for this purpose.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Weaving) A boy who operates the harness cords of a hand loom; also, a part of power loom that performs the same office.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun weaving A
boywho operates the harness cords of a hand loom.
- noun A part of
power loomthat performs the same office.
Sorry, no etymologies found.
Thus the drawboy and the reader of designs were both at once superseded.