In mechanical structures and contrivances, I have always endeavoured to attain the desired purpose by the employment of the Fewest Parts, casting aside every detail not absolutely necessary, and guarding carefully against the intrusion of mere traditional forms and arrangements. The latter are apt to insinuate themselves, and to interfere with that simplicity and directness of action which is in all cases so desirable a quality in mechanical structures. PLAIN COMMON SENSE should be apparent in the general design, as in the form and arrangement of the details; and a general character of severe utility pervade the whole, accompanied with as much attention to gracefulness of form as is consistent with the nature and purpose of the structure.