John McLean

“ In this combination of machinery there are six essential parts:
First. A metal cylinder, capable of receiving the lead in a fluid state, and permitting it to become set or solid therein, and of great strength.
Second. A piston, which is a solid metallic body, fitted to the bore of the cylinder, to work therein accurately, to prevent the charge of lead from escaping around it, and so connected with a hydraulic press, or other motor of great power, as to traverse the length of the cylinder with a force applied of several tons, to force out the charge of lead not in the liquid state. ”

“ It is rare that so clear and satisfactory an explanation is given to the machinery which performs the important functions above specified. We are satisfied that the patent is sustainable, and that the complainants are entitled to the relief claimed by them. ”

“ It is only necessary to examine the machinery combined, to see that its parts are dissimilar to others in use; and there would seem to be no other reason for the use of the new principle, to the exclusion of the mechanical structures employed, except a higher reach of knowledge However this may be, it would seem that, when dealing with a patentable subject, its appropriate name should be given to the machinery by which it was developed. ”

“ The 'newly-discovered property in the metal, and the practical adaptation of it, by these means, to the production of a new result, namely, the manufacture of wrought pipe out of solid lead,' was the discovery. 'There can be no patent for a principle ”

“ A chamber of construction, located between the bridge and the die, and extending from the one to the other, and either conical or cylindrical, provided the end next the bridge be made of greater diameter than the die. ”