Page:Arts & Crafts Essays.djvu/278

 and no more. It should be in the nature of a diagram, specific enough to illustrate the idea and how it is to be worked out. It ought by strict rights to commit one definitely to a certain method of execution, as a written specification would; and may often with advantage be helped out by written notes, which explain more definitely than any pictorial rendering just how this is to be wrought, that cast, the other chased, and so on, as the case may be.

Whatever the method of expression the artist may adopt, he should be perfectly clear in his own mind how his design is to be worked out; and he ought to make it clear also to any one with sufficient technical knowledge to understand a drawing.

In the first sketch for a window, for example, he need not show every lead and every piece of glass; but there 254