Ontario. Dept. of Education · Toronto : W. Briggs · leaf 227
ls an intelligent conception of this scale by having them imagine a heap ofpure white powder at one end of a desk or table in front of them, and a heap ofvelvety black powder at the other end. He should have them imagine him takingequal measures of each of these powders and mixing them thoroughly.… … dark, because it is exactly half-Avay between whiteand black; for tliis reason it has been called Middle.The next step is to have the class imagine a smallquantity of this middle-gray mixed with an equalquantity of the white powder, and describe its tonein relation to middle. It is neither white…
Drawing
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
