TWO:Drawings represent and explain the machinery to which they relate as the symbols in algebra represent quantities, and in a degree admit of the same modifications and experiments to which the machinery itself could be subjected if it were already constructed. Drawings are also an important aid in developing designs or conceptions. It is impossible to conceive of, and retain in the mind, all the parts of a complicated machine, and their relation to each other, without some aid to fix the various ideas as they arise, and keep them in sight for comparison; like compiling statistics, the footings must be kept at hand for reference, and to determine the relation that one thing may bear to another.
TWO:"You can rely upon me," she whispered. "I shall not fail you. Too much depends upon my success or failure tonight. Go round and get the motor whilst I slip into my old disguise. The thing can be done swiftly; I can be back here again before anybody knows that I have gone."
