And now we come to drawings of another kind and these are not intended to please the eye but to work from, hence they are called working drawings.

When most boys, and many men, want to make anything of wood or metal they get busy with their tools forthwith and whack it out willy-nilly and of course a punk job results.

Now the right way to make an article - unless you are going to crochet a sweater - is to (1) see it in your mind's eye, (2) then draw it out on paper to scale, and (3) build it up from the plan as the picture is called. By working this way you will be able to figure out just how much material you will need for it; see exactly how the various parts fit together, and know that it will look just right when it is done.