https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85866&pn=6,844 Steam Engine Patentee: John Ericsson - New York NY Granted:1849-11-06

Abstract: It is a well known fact in the application of steam as a motive power, that the more the principle of expansion is introduced the more economical will be the effect produced, provided some element or elements be not Introduced in the mechanism to counteract it. To give the full effect to this expansive principle of steam either it should be applied to a resistance which decreases in the exact. ratio of the decreasing pressure of the steam by reason of its expansion or dilatation, or what amounts to the same thing the leverage of the connections with the body impelled by this force should increase in the inverse ratio of the decreasing pressure. The ordinary crank engine in general use presents in nearly every particular the reverse of the requirements of this problem, and it would be difficult ,to conceive a mechanism theoretically so ill adapted to the application of this principle, but still from its practical advantages in other particulars it continues in use because of the practical objections to all other plans which have been suggested for overcoming its theoretical defects. Claim: Placing the axis of the crank shaft of single acting beam engines in which the steam is applied expansively nearer to a line parallel to the axis of the cylinder and passing through the axis of vibration of the beam on the principle herein specified, and for the purpose of obtaining a more regular mechanical action on the crank by the application of the expansion principle of steam.
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