File:Grant Brambel - Scientific American (76.5, p. 74) - 1897-01.jpg

Summary

 * US550582. Rotary Motor. 3 Dec. 1895. "My invention relates to motors, and particularly to rotary engines having reversible concentric pistons; and the objects in view are to provide a machine of simple construction with means for causing the maximum expansion of steam, to provide an improved construction of piston whereby the force of expansion is economized, and, furthermore, to provide simple and efficient means for lubricating and packing the piston." https://patents.google.com/patent/US550582A/


 * "THE BRAMBEL ROTARY ENGINE", Scientific American 76 (5): 74-75, January 1897