delivered the opinion of the court. He stated the facts in the foregoing language, and continued:
We are of opinion that the patent is open to the fatal objection that the device covered thereby did not, in vieiv of the ■ state of the art, involve the exercise of invention, and Avas therefore not patentable.
The simply working of a capstan by means of steam is not claimed, but, in the amended specification filed February 7, 1856, is expressly disclaimed. The capstan and the auxiliary *248 engine are both old, the device, consisting in an arrangеment of shafts and cog wheels by which the power of the engine is applied to the capstan, was, as averred in the answer, in common public use in flour and grist mills, аnd cotton and woollen factories, long prior to the alleged invention оf McMillin. The testimony shows that both capstans and auxiliary engines have been commonly placed forward of the boilers of the boat, and that, as early as the year 1847, an auxiliary engine had been used for rotating a windlass, both the engine and the windlass being forward of the boilers. ■ •
In view of these facts, which are either matters оf common khowledge or well established by the evidence, the only field of invention left for the patent to cover was the application, by the old and familiar arrangement of shafts and cog wheels, of the power of an auxiliary еngine to a capstan instead of a windlass. A capstan differs from a windlass in this resрect only, that its barrel or shaft is vertical, while that of the windlass is usually horizontal. It is plain, therefore, that no such ingenuity as merited the issue of a patent was required fоr- this improvement, but only the ordinary judgment and skill of a trained mechanic.
The following cases illustrate the grounds upon which we base this conclusion:
It was said by Mr. Justice Bradlеy, in delivering the judgment of this court in
Atlantic Works
v.
Brady,
In
Pennsylvania Railroad
v.
Locomotive Truck Co.,
In
Hailes
v.
Van Wormer,
In the case of
Phillips
v.
Detroit,
Hpon the ground stated, we think the lеtters patent upon which this suit is based are void. The decree of .the Circuit Court, by which tbe patent was sustained, must therefore be reversed, and
The cause remanded with directions to dismiss the bill; and it is so ordered.
