school black kids cartoon board class chalkboard teaching chalk Chalk Board clip art clip art image school Chalk Board clip art
line automatic chalk johnny snapping Johnny Automatic Snapping A Chalk Line clip art snapping public domain svg Johnny Automatic Snapping A Chalk Line clip art
from "Wood-working Tools; How To USe Them - A Manual" published by D.C.Heath & Co. Publishers, 1896 no author listed working svg technique Using The Chalkline